I will be converting my 92 rs over to tpi this summer but the whole vaccunm line and I guess cooling lines to some extent are what I don't know about. which lines will be to short and where do they go. to make this swap more complicated I am using a setup on an 85 iroc but am going to run it in speed density rather than MAF. I know the plenums on the later speed density systems had three vaccum lines coming off the left side and the maf only has two. what do I do about that. I did a search but because I am essentially doing three conversions at once (TBI to TPI MAF to TPI SD) I am lost. please help. pics would help even more so.

 

The MAF and S/D had the same vacuum off-takes, where you need more connections you'll use the plastic T fittings.

 

what are the 3 vaccum lines on the sd system? correct me if I am wrong. egr, fuel pressure reg., and map sensor right?

 

Correct, but the EGR line actually goes to the EGR solenoid, then from there to the valve.

 

so I can probably re-use the current vaccum lines on the car right?

 

An easy way that helped me is i went to the dealership , showd them with vacuum line i needed , they were all be bent, cut to lenght , it was real easy to figure out which line went where. Not the best way to do things , but it worked for me......also check out ....www.chevythunder.com he has vacuum diagrams that helped me a little too.

 

thanks