i have an 87 iroc witha 350 and i need to know what pound injectors i need mine are bad and how high i can go with them my car has headers exhaust and a throttle body so its still around the 245 stock horsepower

 

stock tpi uses 21lb injectors, you can use LT1 24lb injectors but may need tuning.

 

That is a little vague. Accurate for his 350 engine, but could also be misunderstood too.

305 = 19lb, 350 = 21lb

 

so is there any performance upgrades from 21 instead of just stock ones

 

http://www.youtube.com/watch?v=Emnax2J4FX4

 

Good video, sorta, but it SUCKS as far as presentation and being clear.

He goes through naming them, them calls them as different names! Then the video cuts off the top of them, so unless you have memorized which is which, and ignored what he called them the first time....You won't know which is which he's talking about!

Would it be so difficult to label them? NO!
Would it have been so hard to use a simple stick as a pointer? (This one (pointing).....This one (pointing) NO!


Besides....He started of at what? 43lbs? Isn't that higher than what TPIs are supposed to run at from the factory? And even kinda high for an APFR to run them at? Definitely higher that what the TPI injectors were rated for, which could easily explain why the one that shut off at even higher psi, ran bad the first time. I did figure out that there was a 305 TPI OEM injector, which means it started at too high to start with. No wonder it shut off at like double its designed pressure (not to mention it was 20 year old technology & design. We all know the first generation of injectors aren't as good as more modern ones.

Sorry, but I don't think that was a fair test between the different injectors. Not really surprised that his were the best. I'm not saying his aren't better just saying maybe not as much better as his test implies.