dalecrx

I have a really annoying problem with my crx B16A1 turbo.

Around 5500rpm it tends to pop and bang and hold back. I have tried loads of things like:

Gapping the plugs down.
Checked mech timing.
Checked fuelling. All looks good. around 12:0 AFR.
Ign is retarted by 1 degree per lb/boost.

It only seems to do this when i put my foot to the floor. On half throttle it does not do it.

My spec is:

B16A1 engine standard
6.5 psi of boost
1 degree retard per lb/boost
T4 turbo
external wastegate.
Greddy profec B boost controller.
RC 550cc injectors.

I cannot seem to shift this fault.

I am tuning with crome free. and using freelog to datalog.

Any help really appreciated.

atec

There is a few things to do.

1. new plugs (and a regap)
2. New dissy wires
3 New ignitor
4.new coil
5.a new dissy that will eliminate the option 3 and 4
6.Ignition timing are set wrong(bad tune)
7. wrong A/F mix

Most likely a new set of NGK plugs gapped correct will do fine.
Please fill in if anyone have more Ideas

dalecrx

There is a few things to do.
1. new plugs (and a regap) Been done and this improved the problem
2. New dissy wires
3 New ignitor
4.new coil
5.a new dissy that will eliminate the option 3 and 4
The dizzy is only 3 months old and the problem only started when i put a new engine in the crx. I put the old dizzy on the new engine.

6.Ignition timing are set wrong(bad tune) I have tried a few different tunes but still get the problem.

7. wrong A/F mix The A/F looks quite good but wondering if its because of the change over point when you switch from low cam to high cam on the vtec.

I never has these problems on my last engine.

If it is the dizzy why would you get the fault only at a certain rpm??

boosted k20

check the grounds esp. by the thermostat housing. try a new Dizzy

HamiltonRex

sounds lean bro, you need a proper tune. 5500 is probably where you start making boost, this happened to me when i was untuned, just wanted to rip it once on a basemap, got it up to 5500 and it ran like hell.. got it tuned and its been running awesome eversince.

boosted k20

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HamiltonRex &raquo;</TD></TR><TR><TD CLASS="quote">sounds lean bro, you need a proper tune. 5500 is probably where you start making boost, this happened to me when i was untuned, just wanted to rip it once on a basemap, got it up to 5500 and it ran like hell.. got it tuned and its been running awesome eversince.</TD></TR></TABLE>

if he said a/f are in the 12's then its most likely not a fuel issue. even if he was running lean ~ 13-14:1 a/f the car wouldnt break up. its most likely an ignition problem. swap out a new distr. to see if it helps. also check ur plug wires

vtec.dc2

did'nt see anything mentiond about rotor and cap.. have they been replaced lately?

dalecrx

The tune is quite good. I have spent a while working on it and it is in the 11.5 to 12 on boost.

The distributor is only 3 months old. It was brand new with cap and rotor.

boosted k20

most aftermarker dizzys go bad. change it to see if thats the problem

dalecrx

will do.

I have a spare that i rebuilt a while back so hopefully it is fine.

Ill check it out in the next day or 2.

ill let you know how i get on.

22psicrx

shut off the boost controller and see if it does it, I tuned a car 6 months ago acme back complaining his car was bucking , backfire. Take for a ride with computer hooked up every thing was good, turned off the boost controller no problems.

BoostFedDB8

Try changing out your spark plug wires. They might be arcing at high rpm.