I got some problems with my boost on second turbo, it goes up to 10 psi at 5000 rpm but drops at higher revs, at 7000 rpm I only have 6 psi.

It is destroing all the fun with the new exhaust cause the car is now slower than last G-tech test with oem exhaust......

Can the catback exhaust cause the lack of boost?

 

G-tech is POS... Not very accurate.. or not accurate at all..... Last time i got 1 sec in 0-60 and 600 HP.

 

There are quite a few long-termers on the forum that have used the G-tech and found it very accurate for 0-60 and ET. (It will read high on trap speed because it measures the instantaneous velocity at the 1/4 mile, not the average of last 60 feet like the track.)

Gzon: do you still have the stock pre-cat and main cat? They could be clogged. Also, check intercooler piping/y-pipe for leaks.

 

Ive tried the G-tech and compared it with my drag-times when I had the 323 GTR, and it was very accurate at the times, but 5km/h faster speed then the real speed. I did 13.2 with that car (13psi boost). The RX-7 does 13.9....... thats not what I wanted so se.

I got the pre and main cat on, if I make a downpipe, will I need an ecu? or will it work with just a Boost-control to get boost to normal?

 

I remember now that my "to hot cat" lamp came on friday after a spin with the new exhaust, is that a sign of a burned cat?

 

yup

 

Looks like it's time for a downpipe and/or high flow cat. Be careful driving the car...you don't want to be looking at replacing your motor in the near future!

 

then Ill make a downpipe for the car in two weeks,

is it dangerus to use the car? what can happen?