Compression after 1k boosting!!!

[nissanfanatic]

Well as I posted up a while ago, my compression was 165psi across all four. That was with my friends old tester. Last night I tested cylinder #1 with my new tester and it read 190psi! I would have checked all of them, but my starter was going out. I had to tap it for about 5 minutes to get that out of it. Well today I put the new starter in and broke it in with a compression check. Results are:

#1-190psi
#2-190psi
#3-185psi
#4-180psi

This is on a KA24DE with 135xxx miles after 1000 miles of 5-6psi. Most of those miles were under pretty hard driving not to mention coil problems. I am very impressed. I can only explain the higher reading as gauge errors on the old gauge. This was a gauge I bought about a month ago and this was the first test it has done. I have a feeling synthetic motor oil has something to do with it as well. Damn I am happy.

[D-Bo]

thats awesome man.. whats your next mod??

if you want the safc II, kuruma motoring is selling them for about $260 shipped on ebay.. i dealt with them for my suspension and they were great.. 99.6% is their rating which is what i look for when buying on ebay..

[nissanfanatic]

I'm considering. I really want to get rid of the PVC intake piping. And if I get a SAFC-2, I have to get injectors and a wide-band. So that package will be about $600-$700. FMIC sounds like a good plan for now with the real intake piping. Thanks for the heads up. Yes Kuruma is a great company to deal with. They shipped my Greddy Type S extremely quick. I ordered my turbocharger about a week before I ordered the Type S and it arrived the same day as the turbo.

[TatII]

nice job.

i had my KA turboed for over a year and over 30K miles running 9 psi of boost, been thru a few over heating issues, and knocking issues, and last month on my compression test

1# 180
2# 185
3# 180
4# 180

stock spec is 179 psi and maximum allowable difference is 14 psi.

i passed with flying colors. now i'm waiting for my ecu and injectors to come back and i'll be on my merry way to 13 psi.

[Hit_N_Run-player]

dang, thats awesome guys!! Do you think the SR holds up like the KA does?

[nissanfanatic]

Awesome! It must be the synthetic giving such high results. Whats up with the 185s and 190s? Not complaining though. I'm gonna be on my way to 7-8psi woohooo! I only want 13s out of this engine. Whats the word on those Sards anyways? I saw you were having fitment issues?

[TatII]

i sent them back to japan. the guys that sold it to me are goin to exchange it for a set of Nismo/Tomei 555cc injectors. i gotta pay the price difference and shipping fees.

the cool thing is that the Tomei's actually flow 615cc. nice!!!!!

and yes synthetic definitly helps. the car idles much smoother and the oil doens't burn up as fast.

however a SR maintained right with proper fuel will outlast the KA. its just a proven fact. a KA is built freaking strong for a non turbo engine. but a engine thats turboed from the factory would logically and is stronger.

also about the slightly higher then spec's. this is becsaue when i did the test. i cranked each cylinder for 5 seconds. since its not exactly 5 seconds becusae i'm counting my mouth. thats where the slightly higher numbers comes from.

i highly doubt our engines would have carbon build up. that is the only reason why we would have a higher number.

[nissanfanatic]

Me too. I just cranked it over for a few.lol SR definately outlasts the KA under pressure. Forged pistons are just stronger than cast. Theres no way around that. Now a KA built to the same specs may be different but that is neither here nor there.

Thats cool that you got the injector dispute taken care of. You're going for 13psi eh? I guess you have to wait for the injectors to come in before JWT will finish your ECU huh?

[nissanfanatic]

And just to let you guys know, my engine does blow a little smoke every now and then. Don't automatically assume your engine is shot because you see a little puff of the blue. Doesn't help that I run 5w-30 but I think it is valve seals.

[TatII]

if your valve seals are no good, it would show on your compression test. my engine only blows out white smoke when its really cold outside and on warm up. after it warms up, it stops.

[k3smostwanted]

Originally Posted by nissanfanatic

And just to let you guys know, my engine does blow a little smoke every now and then. Don't automatically assume your engine is shot because you see a little puff of the blue. Doesn't help that I run 5w-30 but I think it is valve seals.

yeah...i dont know. keep an eye on it, which im sure you already know but just a reminder. also, blue smoke does denote that oil is being burnt somewhere...

[nissanfanatic]

Valve guides maybe?

[D-Bo]

man, go to synthetic.. i changed at my second oil change since i got my car and it makes a huge difference.. it revs much more smoothly, idles quieter and more smoothly, overall a better feel from the engine.. i use that and 93 octane to keep deposits out of my cylinders.. i'm gonna rebuild in a few months anyways but its good to have a clean driving car.. and who did you guys deal with for your injectors? is there a specific brand thats more favorable than others?

[SHIFT_KA24DE]

blue smoke? could possibly be piston rings...

[GT500916]

Originally Posted by nissanfanatic

Me too. I just cranked it over for a few.lol SR definately outlasts the KA under pressure. Forged pistons are just stronger than cast. Theres no way around that. Now a KA built to the same specs may be different but that is neither here nor there.

Thats cool that you got the injector dispute taken care of. You're going for 13psi eh? I guess you have to wait for the injectors to come in before JWT will finish your ECU huh?

The KA stock pistons are forged, and they dont have to be replaced unless you go over 350-400hp... some people take the stock rods and shotpeen them to make them stronger to hold up to 400+hp , i know a guy who got 400hp on his stock KA engine, i was all holly crap you are nutts!! but we know how our KAs are so strong. I just thing they made these engines for turbo and then just forgot to throw turbos in there on the assembly line... they probably had a little misprint, like KA24DE instead of KA24DET , its ok everyone makes mistakes...

but i personally would change my rods when i turbo mine, because my goal is around 400hp and to be safe..

i still dont know my compression on my KA, whats stock compression? and how much are those pressure gauges?