Lurch

This is my first post so thought i'd just say hi first...

and i've just been to a dyno day with Nissan Primera Owners Club and had a disappointing day...just can't work out why...

Spec list on the engine is

HKS Header
HKS Superdragger Exhaust
HKS Cams
HKS AFR
FSE Powerboost valve
Big Bore Throttle Body and matched Plenum
Apexi Filter
17o Advanced Timing
99 Ron fuel

and i made 122whp (156bhp for anyone that cares) - 140ft/lbs

the guy running the dyno couldn't see any issues with the fuelling whatsover, we tried the filter on and off to make sure that wasn't a bottleneck...the MAF was clean as a whistle.....

anyone got any other ideas for me?? cos i've been racking my brains all day and can't get my head around it...

cheers

Lurch

CovertRussian

I'm sorry to hear Lurch

What kind of intake are you running? Your engine could possibly be chocking and not getting enough oxygen.

I made 125WHP 113lbs torque and was disappointed but then again I have a lot less mods then you do...

JWT Pop Charger WAI
91 Intake Cam
15* Timing
93 Premium Gas
Heavily sludged Engine


Is that 140ft/lbs torque at the wheels or crank?

BTW, thanks for the BHP number! Now I know my car has around 156-160 BHP

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SR20 91 SE-R

whats the compression like?

Lurch

haven't done a compression test...not got the tools for that...unless theres a way of doing a compression test that i don't know?!

another thing mentioned by the rolling road operator was a crap welding job done on the header where the tubes meet the flange, obviously it's split previously and someone has tried to weld it in situe....so he was thinking that weld could have bubbled up inside causing a restriction...but can't imagine that having such a detrimental effect...

91 se-r

theres alot to factor in when you dont know the engines past. how it was treated before etc... but its very easy todo a compression test. you can buy a compression tester for $15-20 at your local auto store. do a test and go from there!

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CovertRussian

Interesting, thanks for the heads up!

I think he might have a problem... I don't think they have an autozone in the UK

SR20 91 SE-R

or you can do a cheap test (ghetto) but you'll have an idea if its strong or weak. take out a spark plug and disconnect your dist. then get a piece of plastic small enought to squeeze into the spark plug hole making sure its a tight fit but dont push it in all the way. then tap your ignition untill u hit t.d.c on the cylinder(dont crank it just tap it). if its good compression it will shoot out hard and fast, its you have low compression it would just fall out of the hole. ive done this plent of times

CovertRussian

I might just do that!

Lurch

and if it is a low compression problem...anyone know what the likely causes are of that??

SR20 91 SE-R

messed up piston rings, cylinder walls scratched not sealing like there suposed to, it could be a number of things. if the numbers are low drop a just swap a jdm or uk sr20 and call it a day

Jaketips42

Check cam timing?

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Lurch

Probably look for VVL or something similar if it is a terminal problem like that (well not terminal but more trouble than it is worth!)

cheers for the heads up...trying to get hold of a proper compression tester now so i'm not guessing with bits of popping plastic...

haven't got a clue how to check cam timing though...will have to find a how-to somewhere...

CovertRussian

So I did the ghetto compression test and I must say it was sure as heck fun! Especially when I saw the cap fly so far away!!!

I was really excited to see that my compression is actually pretty good, judging on how far the cap flew and how quickly! Now I did just fill the car with Seafoam in the gas tank. I doubt that had a that quick of an effect, but from what people said Seafoam is pretty good.


Now I did use a cap from the Pepsi bottle, it worked great!

Here is a vid of the 3rd cylinder
http://www.youtube.com/watch?v=N4eW1aE2vEI

Here is a picture of how far the 4th cylinder lunged the cap

gEE805

damn thats ghetto haha

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SR20 91 SE-R

hey ghetto but works on giving u an idea..lol

CovertRussian

Sure as heck does! I was afraid my compressing would be crappy due to the sludge, but she surprised me

HkSBlueBird4u

lurch get some cam gears an tune it... depending what hks cams u got id go +2 -2 if u have the 272's... if u got the 264's then + 1 -2

__________________
Danny GDM (HKS)
1993 PRiMERA GT
Nissan Ecology Oriented Variable Valve Lift and Timing

Cliff

Sorry to threadjack, but would changing your cam gears affect your chamber compression? As of the last time I tested, I had 155 across the board, with 264's installed. No variations whatsoever. Would changing the profile +2 -2 change the compression much? I would think that it would if you're reducing overlap, but I'm not sure how much.

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05 Armada - Tow Truck
04 Subaru WRX 'goon

Lurch

sorry mate...i totally missed your post there...i'm not ignoring you i promise...lol...just a bit dense!

Well i ran very near the start (about 25 of us running during the day) and i got the disappointing figure...so talked to everyone there...had a big old brainstorm and headscratch and tried to think of things....talked to the RR guys and they wondered whether it could be oxygen starvation at the top end so they put it back on the rollers at the very end and just whipped the filter off to see if that could of been the issue...

they checked the timing and that was fine...they checked i was hitting full throttle at the butterfly, checked the fuelling on the wide band AFR and they couldn't see any issues whatsoever...(all for free by the way so a huge big up to Power Engineering down in Uxbridge....couldn't of done more for us for free...top lads!!!)

oh and it was 140ft/lbs at the crank

some other things they mentioned was that the Big bore throttle body could be too big and stagnating the air a little...

also that the cams are not violent enough to feed the top end of the power band with the bigger tb etc...

i've got a couple of days off from tommorow so i'll get the leak down and compression test done and let you know the results...

oh and i was looking at the big cam list...and was looking at the stage 2 HKS cams...looked around online for them and they are all listed under SR20DET rather than SR20...

would they be alright in an SR20? Or is it purely SR20DET kit??

Cheers

CovertRussian

Don't worry about missing my post, it happens

I'm actually up for the idea of the MAF being too big. But lets see what more technical people think.

Good luck mate