hey guys took the car to wsid tonight to see what she can do after the tune. Unfortunatly the numbers were not impressive at all. the best that i managed was a 12.7 at 111mph.
To put this into perspective last time i ran the car i managed a 12.1 at 117mph, this was a year ago when the car was making 345rwhp. The only changes i have made since then is some wider tyres and a tune. the car currently makes just under 390rwhp.
Now my questions are, how much power can these boxes hold? I noticed that even though I ran 7mph less I was still at redline in third gear. Could the gearbox be slipping? how fast should the soarers be going when they are at redline (6800rpm) in third.
Wednesday, November 19, 2008 - 10:24 pm, by: Daniel Clarke(Dieseltrain)
Hey mate, Nice to meet you finally
Does your box still retain the Lockup with the convertor? Im guessing it has finally had the d1ck and is slipping. Only reason why you would lose 7mph !
Id say you need to speak to MIke and order that puppy Then knock out some 11's.
The v8's have a different ratio than the tt's... I know in 3rd gear @ 6800 rpm with the convertor locked, it should be around 190-200km/h .
However, if the lockup isnt working and is slipping, you would have more rpm and not enough speed. IM guessing your RPOM should be lower than the TT's as the V8 has a longer ratio in the diff.
Scott thanks for the info. from the looks of it the box is stuffed.
Khris not weight reduction mate. on the wsid weigh bridge it showed 1640kgs. the car was on normal street tyres. i dont know torque figures but i will find out
Thursday, November 20, 2008 - 10:57 pm, by: Khris Cox(Kc95sc400)
Daniel Clarke wrote on Thursday, November 20, 2008 - 09:20 pm:
Nope, UNder full power with overdrive turned off, it should still lockup in 3rd gear.
Mine will lock up in 3rd with od off but it won't lock up in 3rd with it on, only 4th.
Gianni...
FYI, I'm on my second auto now. The new(er) trans still bounces on the limiter a little but not near as bad. Of course I shimmed the accumulators and raised the line pressure on the regulator.
Sorry, still curious..
Slicks? What are your 60ft times?
I'm fairly sure I can get my car in the low 12.6's, maybe even 12.5's. The 12.85 run was with a horrible 60ft, a good tenth and a half slower than my best 60ft. But man, I don't think I could pull off a 12.1.
You should easily be running 11's once the trans is sorted. Good luck and good job!
all my 60ft times are about 2 secs. i have never run with slicks everytime i have run except for the most recent i have used bridgestone s03 235/40/18s on my last visit i ran 275/35/18s kumho ku31s.
knris what boost are you running, with the power you made your car should run a better time. Keep in mind my soarer is a uzz30 so its lighter than the rest and i have coil over shocks which helped heaps with traction.
Did you just shim your trans or do you have a full shift kit, what stall converter do you run.
Saturday, November 22, 2008 - 02:10 pm, by: Khris Cox(Kc95sc400)
350rwhp at 8.5 psi. I also have an SC400. I have Supra shocks and struts. I do have traction problems but also have better 60ft times than you. I average mid 1.8's.
Something is not right. Trap speed calculators put you at 468rwhp at 117mph and 3750 (car and driver). http://www.rpmoutlet.com/dyno.htm I'm a little lost.
Shimmed and adjusted pressure with both the cable and the adjuster on the valve body. 2800rpm stall.
Saturday, November 22, 2008 - 08:59 pm, by: Daniel Clarke(Dieseltrain)
Khris Cox wrote on Saturday, November 22, 2008 - 02:10 pm:
Something is not right. Trap speed calculators put you at 468rwhp at 117mph and 3750 (car and driver). http://www.rpmoutlet.com/dyno.htm I'm a little lost.
AMerican dyno's usually show about 15% more power than the Aussie ones... Which would make it about 398rwhp whhich woulda been spot on for that mph...
I think Gianni's box needs to be binned and a built one in its place
does anyone know someone that has a dyno in the sydney eastern suburbs. i have a feeling i maybe also down on power. The exhaust place that fitted my metal cats told me they were having problems with them blocking up.
Sunday, November 23, 2008 - 11:38 pm, by: Cihan Aday(Cihan)
Gianni, once over a certain power level for a while the clutches tend to hold the power better in the midrange but slip more and more as the revs rise. It can actually be very subtle, especially if you're running a centrifugal setup where boost is gradually climbing.
Thanks for your input. I just spoke to mike from MV Automatics. He said that the box should hold the power and that if top gear was indead slipping then i would have blown the box completly after 6 runs. is there any way to test the box when it goes on the dyno
Monday, November 24, 2008 - 12:04 pm, by: Khris Cox(Kc95sc400)
Gianni,
Hey man, sorry to have been thread jacking. Just curious about your quarter numbers and what's different between the two cars. I'm might PM you a few questions if that's ok.
On your box. You might make a problem more obvious if you use the brake a bit while accelerating. Would put extra load on the engine and transmission. Or, if the dyno you are using can vary the load, you might be able to use the dyno itself.
Just got the car off the dyno. made 312rwhp so its down a fair bit. the interesting thing is i did 178km/h @ 6700rpm, so according to scotts chart something in the driveline is slipping.
Tomorrow ill take the car to work and do a leak down test and compression test just to make sure the engine is 100% then ill install the original torque converter and take it back to the dyno.
just check compression in the engine, it had over 200psi in all cylinders. also did a leak down test and less that 5% leakage, so all good there. Checked valve timing and that was spot on.
I rang michael from MV Autos and he calculated that i have about 12% slippage in the converter which according to him is normal.
So after all this all i know is that the engine is fine, the gearbox is fine but im still down about 70rwhp. What the F##k is going on
matt i just noticed that you are running a manual. that will probably explain why your speed is higher than mine.
I gave michael my wheel specs, diff specs and converter specs and he said that everything is fine interms of wheel speed. He did mention that maybe the converter may not locking up, so i should run a 12v switched signal directly to the clutch.