I got my HSR on everythings working but I just cant get the engine to run properly.
Seems like from 3500rpm the engine just revs high but no power, I keep adjusting my timing for the best setting and no luck.
Could I be leaning out, maby need larger injectors?
Im only running 350 with 22lbs injectors and the HSR, do I need a modified prom?

 

Are you sure your valvesprings are good?

 

Engine is a remanufactured AcDelco, has less then 15,000 km on it.
Should be good.

 

Do you have the stock cam and heads?? Any intake alone will not help much because the RPM band must match your cam. A custom chip is recommended for any engine performance mod.

 

Engine is stock, cam and heads will come later.
Im done my mods for this year but I do need a prom, Ive tried 3 custom proms and all have failed, just dont work well or dont work at all.

 

Thats your first mistake there. I have a AC Delco 350 in mine and from the day I installed it the valvesprings were bad. That singlehandedly was the worse engine rebuild I have ever seen. The valves were not lapped, springs were completely shot. I am sorta scared to look deeper into the motor.

 

Did you open up the exhaust when you made the intake change?
I put better heads on last year with my ported plenum and gasket matching and kept the stock exhaust manifolds.
The VE tables did not change a bit. Ran identical to the previous year.
I was a bit shocked to say the least, the stock manifolds do nothing for air flow. Putting more in means you have to get more out. IMO your exhaust needs more attention if you haven't done any upgrades to this point.
Modified PROM will always help too.

 

Engine is stock yes, I have Edelbrock headers high flow cat, 3" pipe to a magnaflow muffler.
Intake HSR with 52mm Holley TB, stock prom and computer for now till I get my custom prom burnt.
Thing is I have no luck with any proms, Ive had 3 made for me with no success.
Maby the springs are crap in the engine you got but I know one thing for sure, with the stock TPI setup the car ran better than it does now.
I dont expect miracles from this engine but I do expect it to perform better with this intake and a proper prom.

 

Because the TPI develops more power under 4000 RPM's. Mine ran like a guided missle till about 3500-4000 rpms then fell flat on its face. Maybe youre just now noticing it with the HSR. Anyways, that engine of yours probably had 120-150k miles before it was rebuilt, and I know they do not change the valvesprings if they are anything short of broken. My spring/retainer upgrade cost me $100 and was the best money I ever spent.

If you do not want to consider advice that was given to you at your request, then thats your problem. I was in your shoes about a year ago. What could I know.

 

By being a remanufactured engine I would expect all the internal to be new, thats what Im told from the dealership anyways.
Its probably wouldnt hurt changing the springs however I wouldnt bother until I got a cam lifter valves kit.
Like I said before the engine ran good with the stock TPI, got it upto 4600-5000 rpm no prob with good power.
Theres no reason why it wont do as good or better with the HSR, thats my point.
Going to try another computer and prom.

 

I'm trying to say that the stock cam is designed for the TPI. You HAVE to change both if you want to reap any kind of dividends. What is your fuel pressure at high rpm? What is the duty cycle for your injectors?

 

*Beats head against wall*

 

LOL

 

What year car?

Are you datalogging or scanning the car at all? If not, you are blind as to what the car is doing and telling you. You can't make changes unless you have info to make changes with.

 

Mistake #1.Mistake #2.

What heads are ACTUALLY on it?

What pistons are ACTUALLY in it?

What cam is ACTUALLY in it?

For an answer, "stock" won't cut it. The correct answer is a casting number for the heads, and a dish/dome volume and compression height for the pistons, and either a part # or the specs (intake/exhaust duration advertised, int/exh duration @.050", int/exh lift, LSA, ICL).

Most likely, you've got about a 8¼:1 truck engine with either 70s smogger swirl-port heads on it, and a 929 non-roller cam. Basically, one of those magical 165 HP 350s out of the 70s, except possibly even worse because of the swirlies.

Those motors are built to be a replacement for large-customer fleet applications. Think "phone company van" for the perfect mental image of its intended usage. That's what's in your car right now therefore, is a rebuilt phone company van motor; built for phone companies that are too cheeeep to buy the "Goodwrench" NEW replacement engine. It is in no manner way shape or form intended in the slightest degree as a "performance", hot-rod", or "upgrade" motor. It's built to get a revenue-producing vehicle back on the road under its own power, for the least possible expense.

It's going to be a total pig until you do something about the compression, heads, and cam. You're completely wasting your time trying to get it to make power above 3500 RPM, if it is what I'm suspecting it is. You could put a Holley 1100 Dominator and a Super Victor intake and 2" headers on it and dyno-tune it till Doomsday, and it will STILL fall on its face at 3500 RPM.

Fix the fundamental problem of totally mismatched and inappropriate components first, then try tuning it.

Sorry for the bad news; but better to get it on the table up front, and know what you're REALLY up against, than to beat your head against a brick wall trying to overcome the laws of physics which is a thoroughly fruitless pursuit.

 

I do have a set of cheap 083's if thats the case.