used c57 on my old standard engine running stage 3 so brought a set for my new low comp engine was running ok on boost for few hours but now splutters on higher boost.. had this prob when went to stage 3 and was told to make the haps smaller... any ideas please... ta

 

Erm.... make the gaps smaller

 

do you have a figure in mind at all.. they were 0.7 mm so i was gonna try 0.6.. is this too much or little?

 

0.65 is an average figure for a car running 24psi on std head.

 

ok cheers mate... its an a1 rallysport engine with group a head and bd14 inlet and bd10 exh 7.2 :1 comp.. they said the ecu is a group a spec i have read about your closed loop lambda conversions would the ecu be compatible for one of these.. its a L8 in a 2wd.. just realised how much more fuel its used on the greys from greens on my old engine.

 

if using around 25 p.s.i set the gap to 25thou that will stop the spark being blown out when boosting.

 

ok whats this in mm... many thanks

 

In the GpN manual they talk about 0.5mm

 

ok nice one.. ive gone feom .75 to .6 and it seems ok so far so ill see how i get on.. cheers

 

My motor dont like c57s, same as yours after a very short time starts to missfire on boost.

Now use PP8s and had no probs

Steve.