i have done a few things to my wagon now and since i have chipped it has now started to what seems like to be misfiring under high boost im handing it in to my local mechanic (ex subaru mechanic) and he is gonna check the igniton packs and change my plugs just wondering what the best plugs are for me to use? should i go a grade colder? go for hks iridium plugs or ngk iridum plugs please help!!??

my list of engine related mods to my 1994 wrx wagon(import):

chip
arc super induction box
hks super seqeuntial dump valve
samco boost hoses
samco water hoses
uprated forge motorsports expansion tank
twin pipe race down pipe de-cat (all heat wrap covered)
wahlboro uprated fuel pump
full hks exhaust

what power and torque do you think i should expect?obviously the figures u give me will just be a good rough guide cheers chris

 

NGK PFR6 or 7's i would use. It sounds like your coil packs are on there way out, usally happens when you up the boost.

 

which is the colder grade out of those two plugs the 6 or the 7?? how much are coil packs?

 

7's are colder. A possible problem is the pug gap. If the gap is too large the spark can be "blown out" by a high boost level. Before you install the new plugs, set the gap to 0.7mm
PFR7b is fine, the right grade iridium is also OK
JohnD

 

just bought myself a set of iridium hks race plugs grade 8 thought if im gonna do it mau aswell get some decent ones im guessing these will be quite good or..?

http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWA%3AIT&rd=1

cheers chris

im also thinking is it time for me to put a uprated fuel pressure regulator on it? if so what adjustable fuel pressure reg do people recomend and what pressure should it run at noticed there are some on ebay with a guage to tell u what pressure the fuel is set at and also how hard are these to fit?

http://cgi.ebay.co.uk/NEW-Adjustable...QQcmdZViewItem

 

sure poeple on here have had problems with the hks plug. Think they are made by denso and so are just re badged (rebadged price as well)

 

is this true or????

 

Go for the NGK PFR6B, anything else is too cold for your car, especially 8's

Your car has a tdo4 and you'll be running about 260 BHP at a complete guess assuming the chip is running no more than 1.1bar.

Set the gap to 0.7 and see what happens. If you still get the missfire then set it to 0.6 - if that improves things then the coilpacks need replacing.

 

BTW what 'chip' do you have? most available are based on a td05 turbo

 

i got it from esl performance its mapped for a tdo4 boosts to 1.0 bar,am i going to have trouble running these plugs as i have bought these already and are going to turn up tomorrow!!!??? please help

 

IMO I wouldn't fit them and get the 6B's, £35 from AS Performance, next day delivery.

 

is there a website name for this as? cheers for ya help chris

 

http://www.asperformance.com/

Nick

 

are the irdium plugs better than the standard pfr6b plugs as in these ones:

http://cgi.ebay.co.uk/ws/eBayISAPI.d..._BIN_Stores_IT

the code for these irdium ones are: BkR6EIX

im sorry fro being annoying just wanna get the best plugs i can when im doing it thanks for ya help chris

 

best plug for your set up is pfr7b.