<BLOCKQUOTE>quote:</font><HR>Originally posted by willcaprice:
... the chip is the Thermomaster chip from Hypertech the cam is Crane Powermax cam
crn-104211 thats durattion I:194 E:204
cam lift I:407 and E:429 which brought me to something like 428 and 458 at the valve
Ok that's helpful information.
The cam is better than a factory 94-96 Bcar cam, but not quite as good as an L98 cam... but it's still good enough.
Here's the problem. The cam is good enough to pump out 270+ hp if it were installed in a otherwise stock 94-96 Bcar LT1 engine (which has superb heads). You don't have those heads but you do have headers + duals, so your exhaust breathing is very good and probably better than the 94-96 LT1 has. So the 260-270 hp range is completely reasonable with that cam in your car.
But you aren't making that kind of power because the engine control (via the chip) and the fuel delivery are not enough to get close to those numbers.
OK taking the chip first: I don't think Hypertech does very much in that chip because it's a "one size, fits all" chip that, if I recall right, is really only going to alter the spark advance table and it will require you to use premium fuel. The chip might work well in a stock car -- but in your car, I think it will only make it run worse than the stock chip because the spark advance they use, plus the fact that your are probably running very lean, is a recipie for disaster.
Your mods to the engine, on the other hand, have greatly increased the engine breathing... so that means you need a lot more fuel to (a) prevent going lean and pinging, and (b) to actually make a lot more power than stock.
1. Remove the Hypertech chip, and replace it with the stock one. If it runs better, then sell the Hypertech chip on EBay.
2. I assume you have a 9C1 Caprice, so that means you have the large 65 lb/hour injectors. That's good but it's not really enough. I don't think they will be able to supply enough fuel at wide-open-throttle, and they'll limit the engine around 230 hp if I remember right. So that leads to item 2.
3. Read about the so-called "quarter mod" on the http://www.thirdgen.org
web site. You need to raise the fuel pressure in the fuel pressure regulator (FPR); this will *help* but it won't solve all your problems. You may eventually need larger injectors and/or the vFPR (vacuum-compensated FPR).
4. You may very well need to replace the fuel pump with one from a 94-96 LT1 Caprice. I don't know if the stock 91 pump can supply enough fuel to satisfy the engine. The LT1 Caprice fuel pump can pump enough to feed nearly 400 hp, so it would be fine for your engine, and it should be a bolt in. You could also use an aftermarket one like a Walbro.
5. this is the biggie --- I really think you won't ever get that engine running extremely well unless you can get someone to make you a custom chip. The items above are band aids -- they'll help, but I don't expect that they'll lead you to best case. The Hypertech chip is not suggested by any TBI people on the ThirdGen website (for the reasons I already said), and likewise I don't think it's a very good match for your car. If you had done almost no mods to the car, it might work fine. But with everything you've done, it's probably not any better than the stock chip. It might also be A LOT WORSE. In my opinion...
Dunno if this will be helpful to you or not.
The only other suggestion I could make is for you to find a 3rd Gen Fcar owner in your area who has done their own TBI chip burning; maybe they can log some data in your car and try making a chip for you.
In the meantime, try the above items. HTH.