I would like to do a few mods to my RS. But I have a few questions.

1. I would like to put some TPI (LB9) heads on the car. Where are the casting numbers? I saw a long number that started with 141. Would that be it?

2. I would like to go with a better cam. I was thinking an L98 cam. Something mild but better than I have now.

3. I would like to put on an adjustable fuel pressure regulator. Which one should I go with? I see them for TPI engines. Would that generate too much pressure for a TBI? And what is the fuel pressure on a stock TBI engine?

4. Headers, which ones work best for a '92 RS with and LO3.

5. After all of that I would like to custome tune a chip to make it all come together.


Give me some opinions on this set up and what do you think I can generate in HP.

Thanks.

Bill

 

Personally I'd go with a bit more aggressive cam but that's up to you. For the fuel pressure regulator just go to the Tech Articles for Ultimate TBI on this page and modify your regulator to be adjustable, its very easy.

Headers, I'd go with the Hooker 2055's. Just make sure you go with some 1 5/8" primaries into 3" collectors and a 3" Y pipe then make sure you finish off the exhaust with a 3" converter and a full 3" catback.

 

i have some L98 heads at my shop if u want to buy them. thos are for 350's though. number is 14102191. and ill be takign out my Lt1 cam if u want that too.

for chips i use Pocket programmer 2 with winaldl and gmecmedit (now is powertuner or something)

regulator is easy to do. just read the article int the tech section.

 

Thats strange. The number on these heads starts with a 141 and they are supposed to be LB9 heads.

 

yeah, well the rest of the number would say which head it is. theres probably a bunch of heads that start 141

 

Just read a post that said its the last 3 digits not the first three. Now I understand. Just takes me a while.

 

It's OK Bill I know how you feel I just wanted to make sure I was part of this thread cuz' I'm in the same boat. I'm tired of losing to high 14 second cars, gosh darn it!

Bruce (90RS305)

 

Racing in a Honda is like the Special Olympics...Even if you win, you're still retarded!

That's nice Bruce! I bet you got that from the pic I posted a while back too!

 

You might want to check into this fuel pressure regulator: http://www.jegs.com/cgi-bin/ncommerc...26&prmenbr=361

 

i thought L98 heads ended in 083, what is the difference between the 191 and 083 heads.....
and by the way LB9 heads are 081 and the older HO pre 87 heads are 416.

 

Yup! I don't know if you've been on my site but that pic is on there...

 

The LB9 heads are casting # 14101081. These heads are very similar to the '416' casting heads except the '081' heads use centerbolt valve covers. They flow almost the same. They would be a definite step up from L03 swirl port heads.

 

That is what I am shooting for. I have another set that should get delivered to the house this week. Supposedly they are the '416' castings. We will see.

 

You can modify the stock FPR to be adjustable, I haven't done this, but I think I have my old stock one sitting around here somewhere that I wouldn't mind sacrificing to the TBI experiment gods of Arizona

 

With the Walbro 255 and the stock regulator/spring I get dead-on 15 psi.

 

081 heads with a 224/230 cam on a 112° lsa arround .490 lift

That should make some good power.

Kat

 

Those heads will work nice for the price. If your going to the trouble of changing the cam atleast go with a LT1 cam. It's still very mild but will need some custom tuning. The L98 will be dissapointing after all the work it takes to change it. I wish I went bigger now and I've got the LT1. As far as headers the hooker's mentioned above or the slp's like I have are the best bet. Ceramic if you can afford it, alot more heat! Mine went in pretty easy and the paint on them has lasted much longer then my buddies other brand, his already have rust spots.

Also either do the free afpr mod in the tech articles or purchase a vAFPR which is the vacum assisted one from gm. I now have it and like it much better. Oh and might as well get a new intake since it has to come off anyway. Edelbrock TBI or an edelbrock performer rpm with a tbi adapter plate.

We finally got 93 octane in my town which actually made my car run alot better so I think I've got mid to low 14's right now so check the sig if that helps. That's with some custom tuning too.

Chuck how's yours coming along?