The 89 I am currently messing with came from the PO with a Powerhause bolt on horse power package of a MAF, K27/6, jetted banjo bolt and an Autothority chip set I am told by the powerhause guys that this is supposed to be a 100HP bolt on package. I am doubtful of that.
Since I have had it, a new head gasket has been put in. As well as a Tial 38mm wastegate and a gutted cat. I have Lindsey hard piping and I plumbed in a MBC, bypassing the cycling valve and I have dialed it up to 15 PSI of boost. The TIAL holds the boost perfectly and I am quite happy with the way the car now spools. My question is... can the APE chips handle 15 PSI of boost? It is going to the dyno this week (hopefully) to see more about the air fuel ratio than the horse power. Yes I know I need a wideband sensor. But At this point am I in any danger with the above set up?

IPSC

 

I have pushed 15psi all day with Autothority II chips on a stock setup.

 

Same here. I wouldn't go any higher as they lean a bit up top.

 

15# no problem, I tried them at 16 and seemed fine.

 

15psi here as well.

 

Easiest fix or safety is to get some better chips or jsut get a PG and can rishen the top end yourself.

 

I ran 17-18 on 93 for about a year on Stg 2 chips (Weltmeisters), wouldn't think AA would be much more conservative. Ran colder spark plugs & a gutted cat for backpressure reduction. stock
'86 dyno'd 267/310rw @ 17-18lbs.

 

Mark, was that run with everything else stock?

 

Until you know what you AFR is, DO NOT exceed 15psi with APE chips. Once you know what you have, adjust as desired.

 

stock everything else: I had $2k into the entire car! I bumped my fuel pressure accordingly to ensure a nice 11.8:1 AFR on boost (via dyno Daniel

 

The problem is the stock injectors. The Autothority chips will max them out, mine (with a similiar setup) at 4000 rpms and the air fuel ratio starts going up from there. I was one the verge of unsafe at redline at 14.5 psi boost using the 3.0 bar FPR. Take it to the dyno!

 

But you were using Weltmeister while I was advising the original poster who has APE chips and has not been to the dyno yet. No need to blow the headgasket trying to run 17psi on the way to the dyno....

 

Once you go to bigger injectors, is there any benifit to going back to 2.5 FPR??

Also, I owuld like to see some datalogging that shows maxed injectors. My mech ran my car once with a high tech duty cyle meter and (he is very conservative) said he was only seeing about .85 with my stock injectors at 18psi w/GURU chips, 3" exhaust and LR Super 75, stock AFM

???

I now have 42lb, about 18-19psi, MAF and at top revs with ARC2 HIGH set to about 3 clicks BEFORE zero, still seeing about 11.5:1.

So there is plenty of fuel left, and these are only 42lb not 52lb.