Ok, just got all of the tuning bugs worked out. (Adv. timing to 17.5*) and the car is running amazing. now it is ready for the strip!

Any ideas on times for this?
(mods in sig)

What size pulley?

3.8, cant really drop a pulley yet with the higher compression

I honestly think that you will be fine to go with a 3.5 or maybe a 3.6. After my tune I am picking up a 3.5 from a local guy. Or are you gonna wait till you get rockers?

Higher compression? I thought since you did the top end swap its now just like a L67, with the top end swap done dont you have the same compression as the L67. And if thats teh case you should be able to go to a 3.4 with no problem. I would have put it on there and tuned it with the smaller pulley on and saw what numbers you had.

The pistons in the L36 are taller, resulting in higher compression. Top swap doesn't eliminate that.

OO ic ic, thanks.

You do have to be careful, but I don't see why with your mods you shouldn't be able to at least get a 3.6" or a 3.5"

i agree with what rook said. Since the pistons stay the same, the compression is higher than an L67 bottom end. This is why the 3.8 pulley on an L36 bottom end is equivalent to a 3.4-3.5 pulley on a GTP

honestly, i was scanning, and still seeing a little bit of knock.

The blowers in these cars are very hot, resulting in inefficiency to begin with, but the smaller the pulley you go, the lower the efficiency. I know that i could probably go with a little smaller of a pulley and be safe, but if i can advance the timing from 10-11* to 17-18* right now, then it is creating just as much, if not more power then a 3.5-3.6 pulley would.

I'm interested in seeing how fast you are. BTW, did you put in rockers or a cam? I can't remember if you did either and your sig only mentions the springs and retainers.

no rockers or a cam. i did the springs and retainers for the future. i read about changing springs and retainers while in the car and decided to do it while they were out. Rockers are next.

Im hoping for a 14.1 or so

good luck at the track and I hope nothing breaks...I'm soaking up all this info on you guys

With a decent launch you should be in the high 13's , good luck .Chico.

I wouldn't be surprised if you managed a high 13 either.

Have you ever been to the track before?

Another vote for high 13's

yeah. i have launched numerous times, so i know how to launch. but this blower is a totally different ballgame

I went to the track in my old GT; I haven't dared go in the GTP yet. :s

It is a different thing entirely. Let us know how it turns out!

Good luck with it... I'm interested in seeing what a top end swap would produce on a GT... My GTP was running 14.4's completely stock, so with the higher compression I would hope you'd pull off high 13's or super low 14's...

Anyone care to speculate on what I should run? I've got the mods in my sig. I really just want to run a 13.99, that's my goal is to hit 13's.

My tires hook pretty well, especially if it's warm outside (having 245's helps!)

Just got back from the track!


R/T .443
60' 2.064
330 5.812
1/8 8.939
MPH 79.11
1000 11.629
1/4 13.930
MPH 97.04

dropped over a full second with the top-swap

Congrats on beating your estimate!

I think another thing that helps us boosted GT's is our gearing. :-p to you GTPs

13.9 on street tires thru the exhaust is hauling freight...congrats on the successful swap

i was happy with a 2/0 60 on my crappy little mastercraft tires

Awesome! Now we just need vids.

Good track prep......

Congrats on the 13's!

Beautiful! I'm waiting till I get my tune done... (April 20th) but I will be at the track on Sunday the 22nd. I'm hoping for an awesome tune that will get me running good and putting down some good numbers!

How bad do you spin? From a stop I can't hook until almost thru 1st gear, and I bark em in second... so that's gonna be a problem for me!

[QUOTE]Originally posted by drummerboy1307:
Beautiful! I'm waiting till I get my tune done... (April 20th) but I will be at the track on Sunday the 22nd. I'm hoping for an awesome tune that will get me running good and putting down some good numbers!

How bad do you spin? From a stop I can't hook until almost thru 1st gear, and I bark em in second... so that's gonna be a problem for me! [/QUOT

The street is alot diff from the track. In the street dont gun it for them stop give it half to get the tires moveing then hit it. The track on the other hand has alot of stick to it. So your tires will hook. YOu may spin from the being but they will hoook. You know you can just get a set of DRs and you will hook just fine.

mine will burn out through 1st. but i have to agree with what D just said, the track is totally different ballgame. with a 2.0 60' time, i didnt spin at all.

Cant wait to see some times from both of you guys!

Soon and very soon. I'm also anxious to have my car on the dyno and see what kind of WHP I'm putting down.

Nice 60'! Congrats on the 13 second pass!

Shoot, I can spin them till the sun goes down. That aint a good thing! LOL

wow between thunderbat runnin in the 13's and ur guesses with the top end swap i cant wait to see what were all running in the 1/4.....everyone get ur numbers n vids up to compare i know i will

i didnt get a vid of the 13.9 run, i have a few 14.1-14.3 runs, but i dont think anyone really wants to see that

I won't know my car's abilities until the weekend of April 20th-22nd. Friday is tune day, Saturday dyno day, and Sunday is track day.

sounds like an amazing 3 days drummerboy......ordonez were u having trouble with traction i mean 13.9 is sick just wonderin with all the work you have done?

the track was prepped pretty well. on the street traction is not too good, but i had a 2.0 60' time, so traction wasnt an issue

Have Fun!!

cant wait to get to the track my self and see what times i can pull.... any guesses?

14.50's to 14.70's

thanx drummerboy.....might be pushing for the track this friday!!......is 2.0 the best for a 60'......and how do you prep for a launch i know im nto too bad from road races but its completely diff at the track.....does any one raise the rpm's or just tap it a bit let the tires spin a lil grab then punch it?

What the general accepted rule is: Mash the brake, bring the revs up to around 1200rpm or so, then steadily floor the accelerator when you go. If you break loose, you need to slow down on giving it throttle. If you're gripping, try giving it the throttle faster next time. Track prep will be the number one factor into how much gas you can give it off the line, they lay down a VHT compound that acts like a sticky coating. It will be nothing like street racing.

2.0 60' is pretty good for street tires. with slicks you can see sub-1.5's but you just powerbrake to around 1300 and ease into the throttle. You do not want the tires to slip at all.

Does any one know where a pair of drags n rims can be picked up farely cheap

[/qb][/QUOTE]2.0 60' is pretty good for street tires. with slicks you can see sub-1.5's but you just powerbrake to around 1300 and ease into the throttle. You do not want the tires to slip at all. [/QB][/QUOTE]

not to get into a pissing match, but to go from 2.0 60' to sub 1.5's will take a LOT more than tires. i've raced for about 20 years now and even to drop 1/10 in the 60' is no easy feat. going from d/r's to full slicks dropped me .1. especially in a fwd car that isn't making a ton of power. 1.4 60' times are usually 450+ whp cars.

just to clarify, i wasn't talking about my gtp.

i know that. i was just making a point that a 2.0 60' time is not the best that you can do. i was just saying that there are sub 1.5 60' GP's

right, i just was making the point so that no one sees that post and runs out to by some slicks and think that their car will magically pick up .4 or .5's.

The best diameter and wight wheels for the track are the OEM torque stars. Anything bigger or heavier will hinder you.

i gotcha..