Drag racing setup help - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

oSoSlow · 08-07-2015, 11:08 PM

been playing around with the car at the strip finaly. could only manage a 2.2 60' and went 13.0 @111. car only makes 303/250. just could not stop it from wheel hopping. befor i could get a deffanit answer i brought some et streets
in 235 60 15 with some rotas. even though it done i cant stop thinking that i got to tall of a tire for my needs. Any help is welcomed. PS i dont know if this goes here

spitfire481 · 08-10-2015, 01:48 PM

a 26" fits perfect. i run the 26/11.5/15 et street radial on mine. you're going to have to slip the clutch to get it off the line without bogging down. i was leaving at almost 7k rpms and still had some bog. broke an axle before we could start pre-loading the clutch and leaving with the e brake. just going to take some trial and error but with a 26" et street we were cutting 1.6 60's with the ls swap frs. was a little easier with that car since it had more tq to leave with so we didn't really have to slip the clutch to compensate for bog.

mrk1 · 08-10-2015, 02:12 PM

Any reason you went with just a 235?

sosick · 08-14-2015, 02:12 PM

I still get wheel hop with 255 45 17 at 28 psi if i dnt slip the clutch. But if i preload and slip the clutch i get great launches

makesdrivingfunagain · 08-15-2015, 04:36 PM

My previous car was a 5.0 liter Mustang with a manual. The first gear was a 3.27 and I had 4.10 final drive gears. I had 235/60/15 drag radials also. I made 288 RWTQ and only 215 hp on a dyno jet. The best 60ft I got was 1.89, I would launch around 4-5k. however, I was frequently able to get low 1.9's. I think a 235 should be fine. I am not sure what PSI you were running and if you had a full or empty gas tank. Weight over the wheels in certain cases can make a HUGE difference in either getting traction or spinning. What RPM were you at when you finished? What PSI were you running? That is a lot of HP and TQ for this car and trans. I had a built trans, rear end and axles, driveshaft, clutch and flywheel to handle my launches. I was lucky not to break anything then. If I did that with my FR-S I would be surprised if I got 1-5 passes before my trans broke, rear end or axles. My Stock FR-S rear end and transmission wouldn't last very long with drag racing.

oSoSlow · 08-15-2015, 06:58 PM

I went with 235 because i dont think i have enough power to spin 255s and could only find a light rim because DRs are heavy. its prety hard to get weight over the wheels because the tank in in the middle of the car. i left everything in the trunk because of that resion and also played with the coilover settings still only got a 2.2 60
My rims should be here monday and probly gonna get to the track that weekend also getting DSS axles ans a prescation i will try leaving off the e-brake will post later on my what happens looking for mid 12s

makesdrivingfunagain · 08-15-2015, 11:20 PM

I am not sure if you were doing a burnout to warm up the tires or not? The PSI can also make a huge difference! What PSI were you running? Grip can also be affected by the track and the preparation that is done that day or lack there of in some cases. What was the temp outside? depending on the day certian tracks vary in grip

08-07-2015, 11:08 PM	#1
oSoSlow Member Join Date: Feb 2015 Drives: 2014 SWP brz Location: Chicago Posts: 17 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Drag racing setup help been playing around with the car at the strip finaly. could only manage a 2.2 60' and went 13.0 @111. car only makes 303/250. just could not stop it from wheel hopping. befor i could get a deffanit answer i brought some et streets in 235 60 15 with some rotas. even though it done i cant stop thinking that i got to tall of a tire for my needs. Any help is welcomed. PS i dont know if this goes here

08-10-2015, 01:48 PM	#2
spitfire481 Senior Member Join Date: Mar 2013 Drives: 2JZ FRS Location: Pure Automotive Performance Posts: 1,378 Thanks: 97 Thanked 1,354 Times in 621 Posts Mentioned: 27 Post(s) Tagged: 2 Thread(s)	a 26" fits perfect. i run the 26/11.5/15 et street radial on mine. you're going to have to slip the clutch to get it off the line without bogging down. i was leaving at almost 7k rpms and still had some bog. broke an axle before we could start pre-loading the clutch and leaving with the e brake. just going to take some trial and error but with a 26" et street we were cutting 1.6 60's with the ls swap frs. was a little easier with that car since it had more tq to leave with so we didn't really have to slip the clutch to compensate for bog. __________________ Pure Automotive Performance MoTeC Build Thread @spitfire481

08-10-2015, 02:12 PM	#3
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 21 Post(s) Tagged: 2 Thread(s)	Any reason you went with just a 235? __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

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08-15-2015, 04:36 PM	#5
makesdrivingfunagain Senior Member Join Date: Jul 2013 Drives: 2013 FR-S Location: US Posts: 211 Thanks: 128 Thanked 70 Times in 49 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My previous car was a 5.0 liter Mustang with a manual. The first gear was a 3.27 and I had 4.10 final drive gears. I had 235/60/15 drag radials also. I made 288 RWTQ and only 215 hp on a dyno jet. The best 60ft I got was 1.89, I would launch around 4-5k. however, I was frequently able to get low 1.9's. I think a 235 should be fine. I am not sure what PSI you were running and if you had a full or empty gas tank. Weight over the wheels in certain cases can make a HUGE difference in either getting traction or spinning. What RPM were you at when you finished? What PSI were you running? That is a lot of HP and TQ for this car and trans. I had a built trans, rear end and axles, driveshaft, clutch and flywheel to handle my launches. I was lucky not to break anything then. If I did that with my FR-S I would be surprised if I got 1-5 passes before my trans broke, rear end or axles. My Stock FR-S rear end and transmission wouldn't last very long with drag racing.

08-15-2015, 06:58 PM	#6
oSoSlow Member Join Date: Feb 2015 Drives: 2014 SWP brz Location: Chicago Posts: 17 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I went with 235 because i dont think i have enough power to spin 255s and could only find a light rim because DRs are heavy. its prety hard to get weight over the wheels because the tank in in the middle of the car. i left everything in the trunk because of that resion and also played with the coilover settings still only got a 2.2 60 My rims should be here monday and probly gonna get to the track that weekend also getting DSS axles ans a prescation i will try leaving off the e-brake will post later on my what happens looking for mid 12s

08-15-2015, 11:20 PM	#7
makesdrivingfunagain Senior Member Join Date: Jul 2013 Drives: 2013 FR-S Location: US Posts: 211 Thanks: 128 Thanked 70 Times in 49 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I am not sure if you were doing a burnout to warm up the tires or not? The PSI can also make a huge difference! What PSI were you running? Grip can also be affected by the track and the preparation that is done that day or lack there of in some cases. What was the temp outside? depending on the day certian tracks vary in grip

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