Hello guys I have an 89 IROC with a 350 TPI and a 700r transmission. I need to know what I can do in order to get 300HP at the rear wheels. The reason Im asking this so I can start saving up to buy what is needed. Thanks to whoever answerS!

 

Would you prefer to stay n/a?

Your going to probably want to look into different aftermarket intake manifolds, (LT1 conversion, Superram, stealthram, miniram) Camshaft, and heads(this is where you should spend your money) AFR makes great heads... Exhaust needs to be addressed. Shorty headers high flow cat and 3 in single is the norm, you may want more flow depending on how your going to go with this. A great alternative could be headers y pipe and then an electric cutout quiet for the street and loud and free flowing for the 'track'.

Thats a quick run through to get you started...

 

sweet i would prefer N/A

 

How much money can you spend and what kind of condition is the car(motor, tranny) in?

Like rocluver0013 said your going to need a different intake manifold to achieve more consistent horsepower.

 

Thats the thing I want to know in order to save up. I have 0 dollars but I am going to save up so I need some sort of goal. Engine and tranny wise they both seem great but dont know. The odometer shows 55,000 miles but dont know if it has rolled over.

 

Not sure about the IROC, but my 89 GTA would have to have over a million miles to roll over the odometer, iirc. 300RWHP is stout. Some 195cc Aluminum heads (trickflow/afr/Dart/Canfield) milled to get at least 10:1 compression ratio if you keep the stock shortblock (pistons). Stealthram/SuperRam/Miniram/LT1 Intake - gasket matched at least. Cam - a healthy mild hyd roller 218 deg intake duration or greater. Headers - longtube makes it all easier to reach that goal, and a decent catback. Chip tuning - necessary, but have it done right the first time.

It adds up. And you'll want to get other things like subframe connectors, and other chassis/suspension to keep the car happy.

 

My Iroc has a 5 digit odometer so thats why im not sure if it had rolled over. So do you guys think that with like $1,000 I can reach my 300whp goal?

 

If you could do it with $1000 N/A, you'd have to have killed someone for their parts, I think. Maybe if you went all used parts, went with vortec heads and base, and used superram with injectors, and found a deal on a cam, and 1 5/8" shorty tubular exhaust so-called headers, and used catback, you could get'r done for less than $2000.

a 125 shot of Nitrous would get you there for half a grand or so. But that stuff's for racing only, not fun on the street.

 

You can get a roller cam, decent springs and retainers, timing set, screw in studs, 2.02/1.60 valves, gaskets, push rods, machining, and the supplies you'd need for about $1000. That will mean throwing away your original GM cam, throwing away your 80# valve springs, and throwing away your valve spring oil shields and rotators. You'll get over it.

When you remove the heads to install the new vales (lucky for you the heads are iron instead of aluminum) have the valve bowls cut open. Get your grinder warmed up and trim the valve guide bosses without shortening them. Gasket match the port flanges on both sides, then blend the runners from the flanges inward toward the valve bowls. Try to raise the port roofs as much as possible, then clean up the short side radius. Perform the same kind of work on the exhaust side.

Take the heads back and have the valve seats finish cut for the larger valves. Have the rocker stud bosses milled flat, tap the holes, and install the screwed studs. Install your new valves and good springs and retainers.

Reassemble everything with your new cam and good lifters. Mock up a valve and check the push rod length. Get the correct length push rods, then finish assembly.

If you've done well on the porting, and your cam selection compliments your TPI runners, larger valves, and the improved head flow, you should be doing around 320 at the crank by the time the TPI starts to get restrictive. That won't get you the 300 at the rear wheels, but a bit more can be had with some bolting on, programming, and a good torque converter. New, stiffer rocker arms will also help, but that may put you over the $1000 cost limit. You can always do that later for another few HP.

Remember that a TPI is not a high RPM system, and plan accordingly.

 

WOW VADER THANKS!!! I was thinking of just saving up and doing an engine swap but itll be too much money.