Hello.

Did a 11.57 121mph 1/4 all on motor with my c4 this weekend. Now I´m putting in a 175hk BG nos system with Fjo 2stage mini controller and Msd retaring box, bottle heater and shiftlight.

I have manuell trans, how much do u think that the n2o will do?
Have 1.75 60feet, but think I can do little better there. The M/t Et street slicks worked perfect, just a little bit to low launch RPM so there is where I think I can do little better.

/Andreas from sweden.

 

10.20s at 133MPH

 

I agree with aaron.. but I would be curious to hear what clutch your running and if you have done anything to beef up thye rear end or posi unit.. high rpm launches and sticky tires......boogedy boogedy.. a word of wisdom.. have someone hawkeye your burnouts.. if you ever notice one wheel not spinning.. do not launcht he car.. back out of the staging lane politely and replace the posi unit cause it WILL let go.. just a tell tale sign of the torque transfer internally. if it does not let go, there is the risk of snapping a spindle shaft or pretzeling a half shaft.. been there done that.. did not heed the advice given to me.. and it cost me not only the rear end, but a wheel bearing, speed sensor, hub, half shaft, A-arm, and an inner fender well.. none of which were fun replacing or cheap.. keep your eyes out for potential problems from high RPM launches.. if the track is hooking.. the weak link will let go with that kind o9f power.

Chris

 

Well, I´ve missed to write after my raceday.

But now I remember
Did 75hp nitroz to start with, made 11.44 125mph 1.79 60 foot. The start din´t go well.

Up to 125hp nitroz, the clutch went up to smoke 1.82 60foot and 11.36 127.5mph

Made a "first gear lockout" Clutch slippering 1.80 60foot. 128.1mph 11.32.

201m = 100mph 7.41.

I have a centerforce dual friction. And now i don´t no what to buy. Mcloed seems nice, but very expensive

So my high ET, does it depend on my clutch. I don´t think the nitroz did so much
No I have the 175hp jets in, if I have a clutch I will take it to the track in end of aug.

I have all standard in driveline What is the posi unit?? 2times my rear have only one tire spinning after getting hot.
So u really think 10.2 133mph is realistic?

/Andreas

 

the mcleod is actually ont that expensive comparatively.. remember you are not just getting the clutch but also a new flywheel.. if you tried to purchase a new dual mass flywheel along with an upgraded clutch assembly you would actually spend more money on the setup then going with the mcleod unit and it comes with a new master cylinder.. hard to beat and it WILL hold all the power your car will be throwing at it!

another benefit is the single mass flywheel can be resurfaced if you ever need to swap out the clutch disks.. great setup.. doubt you will find another out there that holds power and drives as smooth!

Chris

 

At 11.48 you should have got booted off the track,you are lucky.
10 's shouldn't be a problem .You need to shift at a lower rpm.
I would also think about a window switch.With a 100 shot you should get about one second in the 1/4.
Your fuel presure should be turned down to 40 psi.

 

Yeah, I know that u got a flywheel and master cyl in the mecloed kit, and it´s maybe worth it

I shift at 5500rpm and have a FJO 2stage progressive minicontroller. Also msd digital retard box & bottle heater.

And the fuel is 40psi

In sweden it´s new for this year. Lower than 11.00 you must have a cage. It was 12 last year.

/Andreas

 

By the way, how to calculate the horse power from 1/4?

*11.32 127.5 with n2o (125hp)
*11.57 121 all on motor

AKS: I saw that u made that somewhere on the forum.

/Andreas

 

The other night I went 11.19 @ 120.98 with a 1.58 60 ft time NA. Spraying 120 hp with the system pulsing from the fuel pressure safety switch, 10.72 @ 129.42 with a 1.62 60 ft. If it would of gone a high 10.50 I would have been extremely surprised.

 

Okej, so the 11.19 was all on motor? all standard driveline? auto or man?

If my car goes a high or middle 10 I´m happy, if not I´m.. don´t know what to do

I know that my problem is the 60 ft, so I hope with a new clutch it will make the 10! and a nice 60ft and driveble from the track

/Andreas

 

The 11.19 was on motor. The car is an automatic. Good luck.

 

Andreas,

Motor only:
Based on the trap speed, you would be producing ~480RWHP. However, the trap speed will be exagerated by spinning of the tires. If you reverse the calculations, you wind up with the car should have gone 11.20ET. As you went 11.57, that is a clear indicator that you lost ~3/10s due to lack of traction. So now you back off the MPH to 117.8 and you get 443RWHP and the 11.57 ET. So I would say somewhere right around 450RWHP on motor only.


N20 Run
Based on the 127.5MPH trap speed, you would be producing ~562RWHP. However, in this case, it is clear that the trap speed may be affected by spinning of the tires. If you reverse the calculations, you wind up with the car should have gone 10.69ET. As you went 11.32, that would say that you lost ~6/10+ due to lack of traction. In this case, you can not just back off the MPH to get the correct HP, we might assume that you picked up ~125RWHP from the addition of the BG N2O, which would increased your car's power to ~575 and dropped your ET to the 10.60 sec ET range with trap speeds in the 128MPH range. So either smaller jets were installed in the N2O system, you were not able to use the system for the complete run, or the starting RWHP was off a bit.

Remember these are subjective calculations and are used only under the premise that you can get your car down the track efficiently.

It sounds like you are having fun learning with the new N2O system.

Aaron

 

Intresing reading

I have this proggresive controller and on the 127.5MPH I had "first gear lockout" and slippering clutch 1.8 60ft. So that helpt to make a bad ET.

Yeah, I really love the n2o. I had to use it for the first time on a "streetrace" yesterday. A bmw turbo, without gas I din´t see if I loose or win time on him. Next traffic light, the 175hp N2O showed me what nitroz power is The bmw was pretty far away behind :P

About 450rwhp is pretty good, ported standard heads with 2.00 intake and 1.57ext. customcam, 383cui. headers no cats, 58mmTB.

Do you have any tips with the dana44? 3:73? splindes or someting? Will order in okt-nov new clutch (mecloed).

Thanks 4 the help!

/Andreas