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Drag Racing Discuss Drag Racing here be it dirt or tarmac. Sponsored by Sydney Dragway. |
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#1 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Having really crap 60's I thought I might be able to get somewhere with carb tuning, however it seems my carb is not the problem, deatails are XB sedan approx 3200lb full manual c4 5000 stall (not built for this car) 3.7 rear 26" M/T drag can only manage about 2000rpm off the line without creeping out of stage, flashes to around 4500 (shed test only lol) shockes are competition engineering front and rear set 90/10 front and 50/50 rear, no noticeable wheelspin and can only manage a best of 1.9 flat with approx 500fwhp and 426ftlb. Any help appreciated.
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#2 | ||
Banned
Join Date: Apr 2009
Location: SA
Posts: 5,213
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What rear brake setup do you run,is their a line lick used to clamp rear brakes?
What diameter and car did the convertor come from. Are the 3.7's in their for possible NOS or just a street/strip compramise? |
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#3 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Drum rear's, I use a line lock to stop pressure to fron brakes. Diameter I'm not sure, maybe 10" came from an XP ute 530+hp, 3.7's are there because that's what I started with before the converter and extra torque/power. I have a mini spooled 4.11 to go in but thought I should get beter with what I have.
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#4 | |||
Budget Racer
Join Date: Dec 2004
Location: Melbourne
Posts: 2,420
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Quote:
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12.1@112Mph 285rwkw on n2o Cleveland Power |
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#5 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Yeah sorry, using it to stop rear brake lol
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#6 | ||
Banned
Join Date: Apr 2009
Location: SA
Posts: 5,213
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Id get the 4.11's in if you still have 800-1000rpm useable power left when crossing the line in top gear.
So while staging and stalling her up you have eff all front brake pressure,is this correct?Try hooking it up to lock the rear brakes and leave front brake pressure normal.Have the switch setup to a purge button on the steering wheel and use it like a trans brake so to speak.Sounds like not enough rear brake pressure to stop the creep.Solution above fixed it for me ![]() If its a 5000rpm stall then its no more than a 9" ![]() Is it a nitros convertor by chance? |
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#7 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Freddy I have at least 1000 left up my sleeve just thought I should get better with what I already have (probably wishfull thinking) not wanting to F%^k around with brakes at the moment but thanks for the idea, definately not a gas converter. Thanks for your help, very much appreciated
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#8 | ||
Banned
Join Date: Apr 2009
Location: SA
Posts: 5,213
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What drums are you running?
Disregard some of my last post as you changed the line lock thingy lol.I still think its a brake issue.Is the convertor a loose or tight 4500? |
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#9 | ||
Budget Racer
Join Date: Dec 2004
Location: Melbourne
Posts: 2,420
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Line locks are designed to hold the front brakes on during a burnout so you don't fry your rear brakes. And stop the car creeping forward when staging.
I've not heard of anyone using a line lock on the rear brakes, but whatever works!
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12.1@112Mph 285rwkw on n2o Cleveland Power |
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#10 | ||
FF.Com.Au Hardcore
Join Date: Dec 2009
Posts: 905
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YOu still want to use the front brakes to help it creeping .
However if its a 5k convertor and your creeping @ 2000rpm , you really need the extra front brakes to help hold it . Flash and Stall are 2 different speeds . Maybe its designed to flash alot more ? Or your engine cant make the torque to make this convertor as loose as it was on the old engine . I would try Freddy's suggestion with the brakes , but i would be throwing in the 4.1's in a heartbeat ![]() Have you tried Sitting @ 1500rpm and then jumping on it ? Sometimes allowing the FLash to pul it out of the hole works . Just look at some bigger cube engines . Otherwise Transbrake will sort it our once and for all ;)
__________________
1998 AU VCT Ghia - Stock as a rock - Wifes car 1991 Toyota Soarer TT - 11.72 @ 116.7mph 2004 Ford Escape XLT V6 - Family Ride . |
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#11 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Thanks DT, no haven't tried that yet, will do next time out. I've no doubt mine doesn't make as much tq as the engine/car it was built for (was just a lend me to try). $.11's will be in after xissy so do you think a 1.9 is acceptable whith my current combo?
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#12 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Freddy i tink I calculated 10% slip
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#13 | ||||
The Fun Mobile
Join Date: Dec 2004
Location: Cairns
Posts: 5,219
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Quote:
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408 cube Cleveland TFC @ AFD 2V, 750 DP 10.7 @ 125 mph 2V powahhhhh |
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#14 | |||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Quote:
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#15 | ||
FF.Com.Au Hardcore
Join Date: Apr 2006
Location: Melbourne
Posts: 900
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Not sure what handbrake setup you have, but I use the handbrake as well in my EF, could only get about 1psi off the line without it and now i can get 5psi.. 1.81 60' on a stock stall.
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FG XR6T GU Patrol Duramax |
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#16 | |||
Tribal Elder
Join Date: Jul 2005
Location: Yarrambat
Posts: 2,278
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#17 | ||
Regular Member
Join Date: Sep 2007
Posts: 59
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Drag racing in group three is all about being consistant, not fast. Of course we all can't resist the urge to go faster, and to improve the combo to it's best, and thats great. Consistant cars win meetings though.
X2 for stage it at 1500 or even 1700, just find a rev level that is easy for you to do. Very hard to cut a good light when you are fighting with the car to hold still, not to mention that you are probably giving yourself a different rollout every run and that changes your RT. |
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#18 | ||
FF.Com.Au Hardcore
Join Date: Dec 2009
Posts: 905
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If its leaving the line @ 2000rpm which is way under the torque curve , your probably finding it lazy out of the hole which is why its not cutting the 60's .
If you try less revs and allow the " flash " to pull it out of the hole , being up around 4k+ should pull it out and get into the 1.7's or even 1.6's . If my little 150 cuber ( yes 2.5L ) 6 cylinder with some boost can run 1.60 60's on radials ( with more in it ) weighing 3680 pounds with driver , surely yours can get very close to matching that ![]() Good luck next time out . Boosted cars are very different to N/A cars . Boosted cars dont just need rpm , they just need boost . N/A cars need the rpm and to be in the Torque curve well and truly , to pull the lump out of the hole . Mates Cortina with a windsor has gone 10.9 on radials using just 1800rpm then flashing ( bout 3500-4000rpm ) . Its gone flat 1.6 60's .
__________________
1998 AU VCT Ghia - Stock as a rock - Wifes car 1991 Toyota Soarer TT - 11.72 @ 116.7mph 2004 Ford Escape XLT V6 - Family Ride . |
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#19 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Thanks dirty and DT, definately will try that idea and see how it goes. At the moment I don't race comp only the street meets as they call them here, although I wan't to be consistant I'm more interested for now in seeing what I can get the et's down to. It's about having fun for me but the poor 60's aren't making me smile lol the car really hooks in when I change into 3rd but there is no road left and the rev's are just starting to climb. I had talked to a local racer about it before and he told me a few things which got my et's from a 13.1@106 with a 2.02 60' to the current pb of 12.61@108 with a flat 1.9 60' never changed anything apart from the way I drove it so it shows that advise/ideas are invaluable, so thanks to all those who gave advise and ideas. Will hopefully getting a run next Saturday so will post up the results then.
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#20 | ||
1975 XB Falcon 500 Coupe
Join Date: Jun 2008
Posts: 86
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G'Day JG33RD
Did you have any success with improving your 60' times? DR |
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#21 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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No DR, didn't get there. Got called out to work and the weather was looking sus anyway, I think it got cancelled so was better off at work making money. Local track hasn't posted a new calendar yet so have to wait and see, hopefully I can get a run in soemtime in Jan, if the weather holds out (which I doubt). How about you, ran that 11 yet?
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#22 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Got some passes in tonight, new pb's 12.48@108.69 1.831 60', new best mph of 12.82@109.75 2.1 60'. Tried launching from 1500rpm but didn't seem to work, I think that's more my burnouts at fault threre, first pass tried that but no time slip given the next time I tried I got the 2.12 60' but ran 109? The best 60' was leaving the line the way I have sone before but my burnout was a bit more intense, it may be the burnout that it causing my bad 60' times. Anyway I'm happy with the times I have with the gears currently in the rear and thanks for the advise given by everyone. Will be changing to the 4.11's and giving the tyres a bit more curry in the future.
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#23 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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I forgot to mention, the convertor seemed to be flashing to around 4000-4200 not 4500.
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#24 | ||
1975 XB Falcon 500 Coupe
Join Date: Jun 2008
Posts: 86
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G'day JG33RD
Great to see you are making progress, do you mean by the burnouts that you are having traction issues? DR |
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#25 | |||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Quote:
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#26 | ||
Banned
Join Date: Jan 2011
Posts: 293
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when u say its creaping is that with front brakes locked?
how big is ur cam? do u have enough vac pressure in the bootser to hold the fronts on lock to get it up to stall vac tank might be a good option and cheep it ur fronts arent holding ya |
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#27 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Yeah with front brakes locked although they are just cheap standard pads, I remember someone else posting about using different pads for foot brake starts. Don't know about booster vaccum, what's involved with a vac tank? Cam is Howards 296/306 .630/.644 adv 104 I/cl not sure if that's the specs you're after.
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#28 | ||
Banned
Join Date: Jan 2011
Posts: 293
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if its to lumpy it wont hold enough vac in the booster for the brakes to clamp hard enough a vac tank is like less than $150 and hold a decent amount of vacuume so the booster will hold pressure
its very common with big cam set up's and creeping through traffic by the 3rd brake press at the lights its usually creeping on ya on the street so do u have enough force to lock the wheels at the staging lights or is it creeping ie still moving? just a thought thats all |
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#29 | ||
FF.Com.Au Hardcore
Join Date: Aug 2010
Location: NQ
Posts: 1,781
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Not sure if I fully understood that F6 but I don't have any trouble holding it in stage below 2k rpm, it's only when I try to get the thing launching closer to the "stall" speed that it wants to creep through the stage beam. I understand there is a difference between stall and flash speed and I stated before I thought it flashed to 4500 which isn't right it's closer to 4200. Thanks for the info on the vac tank, might have to keep that in mind also.
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#30 | ||
Banned
Join Date: Jan 2011
Posts: 293
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ok when u stall it up will the front tyres slide (locked) or roll like ur letting the brake off?
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