A have a few questions on mods to the L-98?

1. What is the max HP flow of a Ported Runners, and Plenuem?

I am thinking of doing the 113 heads in the future, Porting/Polishing, 3 angle valve job, 1.6 Roller Rockers, etc...........

2. What kind of HP increases would I see with a mild cam, heads done, and the intake ported as much as possible?

Thinking of keeping the intake, because of a stock looking apperance, and because the Superram, Miniram, are so much money.

I am aiming for mid 12's at 112MPH with this combo, and oh yes! I will be changing the 3.07 rear with a 3.54 rear. If any of you are wondering about my current mods they are in my sig.....

I guess I will also need to burn a new chip to work with the combo.

Hope to hear back from you. If any of you, Have some good proven combo L-98's or even you that took of the L-98, do post them!

I do not want to dig into the bottom of the motor, Just head,cam,intake. I would think that this combo is good for 12's, But what I really want is a MPH of 110-114. I do have a 88 4+3....

Thanks........


3. Would this be about right?

Ported Plenuem, and Runners? 15-20 HP
Heads Done? 40-50 HP
Cam? 30-40 HP

= around 100 horse, and right now I am 275/375. I am thinking that 375/425 would be enough to get mid 12's............I might be far off, What do u think?

 

 

what have you done with the exhaust???

 

I dont see you getting 40-50 out of heads, more like half of that.

 

:iegree:
Let me give my estimates:
5chp (maybe)=Ported Plenuem, and Runners?
25-30chp(*)=Heads Done?
30chp=(**)Cam?
(*) For this much gain from heads you need to have the #113s pocket ported, larger valves, and a 5-angle valve job.
(**) Expect this from a ZZ9 cam.

You should not need those mods to get you '88 L98 with 3.07s into the 12s.

For example last Sat evening with a DA of over 1,000', Vic'89 against me dialed a 12.68 and ran a 12.75, on the brakes. Check out his sig to see his mods.

If you follow his path and want to stick with stock intake parts, try the siamese intake base. This mod has added around 20chp at 5,200rpm with only a slight loss of low end torque...and it cost's almost nothing to do.

If you do a free flowing intake & exhaust along with a few other things you may not need heads & cam to break 12s.

 

could you go into a little more detail about siamesing the intake? or point me towards a site that i can do a little reading? Is that what you refer to as a 'free flowing intake'?

 

Well changing the TPI base, runners, plenum is part of doing a free flowing intake. Of the several popular intake setups available the siamese base is the only one that just takes a little cutting and grinding.

But free flowing intake realy means from air filter to the intake port. We can do a cut lid with K&N or ram air with K&N along with gutted MAF and ported plenum to help get air to the runners. The siamese base just takes that air to the intake valve a little better at high rpm.

This idea came from www.thridgen.org/ and a copla buys here have tried it. I had cut (using a Dremel) a 1" wide hole about 1" deep into the partitions between adjacent intake base ports and about 1/4" up into the respective runner base, for smoothing purposes.

Dyno data before and after the siamese base are on my site. I thought I had put pics up onto my site, but apparently not. If you like I can e-mail some to you.

 

see the pics of the base
http://www.thirdgen.org/newdesign/te...meseport.shtml
-Beppe-

 

I'm still running stock ( ported ) TPI unit
and I've got 338HP out of it.

Check sig for details.

 

i am interested in the pics. please email them to Mad-Mic@comcast.net

in your opinion was it worth it? it looks like your dyno numbers and ET were about the same in the same weather. i'm debating on trying this with my 2.59 gear because of the 1800-2600 rpm dead spot until the cam starts coming on with the torque.

need opions please

 

is that at the rear wheels?

my last dyno run before the Air Delete pulley and Crank Pulley was 245 rwhp and 354 rwtq. the car was very hot at 220+ water temp and blew the EGR hookup on cylinder 8 halfway thru the pull. i thought it was a header gasket

 

Nope.
Thats 338 crank-HP and 387 crank-ftlbs

 

i meant siamese, so u think going that route, then 80 horse is possible?

 

65Z01-
can you please let me know what you thought about after the porting work and email me those pics?

Thanks!

 

would like an email as well, thanks!!!!!!!!!

winter project

 

OK guys the pics are on the way, about six of them in .jpeg, so it may take a while.

 

Wait till we see a -500 DA day.

High 12's are very possible with a L98 and bolton mods. But you have to be able to 60' hard. That is the key with an L98.

Vic

 

Wait till we see a -500 DA day.

High 12's are very possible with a L98 and bolton mods. But you have to be able to 60' hard. That is the key with an L98.

Vic[/QUOTE]
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i find it hard to get a good 60 foot time, but then again i have only done 7 passes all together. worst being a 2.5, best being a 2.12, with the 2.12 i had a 14.02 @100.60 MPH. i find the stick tricky to launch, or maybe i suck.

 

Wait till we see a -500 DA day.

High 12's are very possible with a L98 and bolton mods. But you have to be able to 60' hard. That is the key with an L98.

Vic[/QUOTE]


u ran a 13.34 at 102MPH with some mods. gee golly, i run a mph close to that and i dont even break into the 13's......

 

What's up with the BS Flag ?

Vic