Ok what are the WHP numbers needed for a 2100lb car with driver to hit 9sec. List some of what you guys are running to make 9sec possible.

asking because this is what happened: dyno says we made 533whp and when ran at track, we only topped out at 127mph trap speed... WHY??? 1st dyno run 507whp, 2nd 527whp, 3rd 533whp, 5th 531whp. Seems consistant with a/f under 13:1. And no not the driving!!! It was good driving in any case!!! kept getting mid-high 120mph traps only!!!

Setup: 92 HB 2100 w/ driver, t70/comp .70ar 70mm wheel;turb .68ar .66mm wheel, air/air intercooler, 22psi and dyno said 533whp/350lb-ft tq, 1.9L GSR, RC 1200cc, all rest of fuel hardware is quality name brand ran on accel dfi gen 6. Lastly 96 LS tranny <----Is this BAD??? 25inch M&H on 13 Bogarts <---is this BAD???

Let me hear your thoughts guys... I know you guys have been there done that.

 

whats ur 60? im not trying to be an *** but does the car hook?

 

That is enough power to run in the 9's but your trap speed is too low. Just a wild guess but you might be too lean (at near 13-1) and you might be running out of power and fuel in 4th gear. You should be going at least 140mph.
Hard to tell much more without knowing your 60' etc.

 

You should be going over 150mph...what are you shifting the car at?

 

sounds like you've got 530 PEAK hp, and a bad curve...

 

I'd have to lean towards tony1's comment, sounds like the car is probably an animal at the top of the rpm range, but is not staying in boost very much during the run. Is it possible to post the dyno chart, along with where you shifting the car at the track rpm wise?

-Richie

 

i think your LS tranny is whts killing you...... do you fall out of boost when you shift gears? especially in 2-3 and then 3-4?

 

tell us your timeslip please, will help as well....

 

350wtq? You may need to teak the turbo a/r sizing which makes for a laggy bottom end and a peaky top end. Check your wastegate actuation. Is it opening early? A T70 turbo is nice but if you tune up is not optimized to take advantage of it your better off using a PT61 or PT67mm wheel.

Tony is probably right, what is your air fuel in 4th gear under full load? 12:1-11.5:1 is really where you want to be.

 

I'm going to go with all of the above. Please post a dyno graph and a break down of your time slip.

 

Ok guys just came back from another dynojet. Same results!!! This time 529.5whp.....

Ok here is my problem.... It did run lean a bit at first... so I did about 530whp. Tuned it down to 11.7-12.0 a/f from 13.5a/f. Lost a little power to 501whp, but still that is good for 21-22psi on 1.9L GSR. I'd rather run in that zone anyhow. When Vtec kicks at about 5.5K boost starts to climb to 21-22psi. Then as 6-6.5 comes it is full 22psi all the way to 9.5RPMS. Power really never dies. I mean like tony said: PEAK POWER is 501@9.3-9.5RPMs. I am stuck... shouldn't power peak out and slightly go down???

Ok at the track: 1.55 was best 60ft., but in 2nd all wheel spin!!!(120ft wasn't good then although 60ft was good) I looked at the video and in 2nd all wheel spin.....when i get into 3rd there is a slight lag and then power climbs quickly like NUTZ....I get into 4th and all LAAAAAAAAAG as ****....boost finally kicks but i am at the end already... Problem may be gearing and slick sizing.... are t66s and similar size turbos laggy like this even if taken to near 10K rpms??? I should've bought a t66..t70 may be too big...but i've seen big dogs run t76+... So I'd thought t70, but seems harder then I thought... I'll try my best to get this beast running into the 9s.

Let me know what you guys think I need to use to hit 9s... thx tony and other guys that are helping me with comments......

 

Ok, can I email someone the dyno sheet and then they can post it up.... btw guys I really need to get this car into the 9s because there is a Grand National kind of crap talking... he's 10.4,10.5 but that may not be his max potential...another Stang that does about the same may want to run too... where we are from most HotROds doubt the imports very much so. our best is 10.5s@133mph with 1.61 60ft......

also i've noticed with wheelie bars i get consistant 1.55s to a worst of 1.58s....but current setup is not working too good with more hp and big turbo...

Let me know what brake system.... i could hardly stop in time... ;(

 

Sounds like the car is getting ok 60 fts...I dont think the gearing is wrong... When we ran a 25 tall tire, I was using hydro ls gears in a cable trans case and the gearing was perfect for around 500-550 whp. I shifted the car at 10k and probably ended 4th around 9k ish.

Just make sure that the boost is staying up with that large of a turbo...id try to shift it around 10k if u can...

Buy a parachute to stop

 

Honestly if you ran 500-550whp and ended at 9K 4th gear then something is wrong with our setup. I'm leaning towards the turbo.

When we ran a t3/t4S: turb .68a/r stage 3 wheel comp. .70a/r 56 trim and only made 430whp we did 10.5s at over 130mphs and believe me NO LAG whatsoever. Should I rerun this turbo and see??? We couldn't get boost over 20psi due to wastegate so we took that turbo off thinking it was the turbo. Found out the wastegate wasn't holding pressure......

thx guys...

 

what did you hit when you ran a similar setup to ours... you ended in 4th at 9rpm so your traps are probably pretty high.. let me know bro..

thx

 

Basically im going to say what everyone else did but heres your problems.

1. Gearing- LS hydro tranny = 1st/3.23, 2nd/1.90, 3rd/1.26, 4th/.966, FD/4.26

At 9500 rpm in 4th gear on a 25" tall slick you are able to reach 172mph.. in 3rd gear you are able to reach 132mph..

Your car is only using 3 gears through the 1/4 right now. With those 3 long gears you are also not accelerating like you could be w/ 4 shorter gears. The shorter gears will accelerate you faster and also keep you in your peak powerband.

2. Turbo- Your powerband is wayyy too small and peaky for that gearing. The turbo is not really too big but w/ those gears u have so much spread that ur turbo has become too big. Get the gears right and u will stay in ur peak power and accelerate much, much harder.

3. A/F- The a/f was too lean and while it may have made good power on the dyno it probably wasn't making the power on the track under heavier load. Looks like you got that taken care of though.

500whp @ 2100lbs w/ gearing and traction you'll be running close to 150 through the traps.

 

i agree! get a b16 trans and a gear based boost controller. maybe a little suspension work too.

 

I traped 157 mph with that setup. That was also a 60-1 turbo. I forgot, I was running the 24.5x9.5 m&hs at the time. I guess that adds a little to the gears, but if you want to keep the same trans...maybe downsize your slicks...you will get a wider tire which should help as well. That gear ratio was PERFECT for us with the ls trans.

On a side note, our fastest time we ran to date with our crx was with an ls trans only going through 3 gears...less shifting...less time not pulling on the top end I guess.

 

to use a ls trans use a pro drive 4.73 final drive

 

i agree with you mike, but a 60-1 and a t70 are two totaly different turbos. the 60-1 is gonna give you a fat midrange all the way up,which works for a ls tranny. but the 70 is gonna come on alot later but make quite a bit more power where a b16 will keep it in the zone.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fast is fun &raquo;</TD></TR><TR><TD CLASS="quote"> to use a ls trans use a pro drive 4.73 final drive </TD></TR></TABLE>

The 4.73 will make the car accelerate faster, but the gearspread is still too long...

 

As a cheaper alternative you can also look into putting type r 3-4 gearset in your ls tranny. That's what I'm gonna do, according to the gearing calculator that will give me 3-4 mph more in those gears than the type r tranny. Anything is better than the ls in my opinion, that's why I'm trying this. I can't afford a whole new tranny and this SHOULD give me the best of both worlds. Larry

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ninesecteg &raquo;</TD></TR><TR><TD CLASS="quote">i agree with you mike, but a 60-1 and a t70 are two totaly different turbos. the 60-1 is gonna give you a fat midrange all the way up,which works for a ls tranny. but the 70 is gonna come on alot later but make quite a bit more power where a b16 will keep it in the zone.</TD></TR></TABLE>

yeah...maybe so

I want to go back to my little tires, 60-1 turbo and ls trans...