Thread: Rev limit, Tomei Procams and oil burning (check #1 and #3)

Hi,

I've searched a lot, but still have doubts

I own a Primera P11 GT (10:1 compression, blacktop) which currently has the following mechanical mods: SSAC 2.5 header, decat, 2.5" exhaust, AEM CAI, Fidanza flywheel and UR 2pc pulleys.

I am about to buy Tomei Poncams (260mm, 11.20 both int and exh). My stock rev cut is at 7.3k rpm, but was planning to remap my ECU (damn OBDI, must try in a local tuner) and maybe increase the rev limit.

An 8-8.2k limit would be good, since changing a bit before it I would still be in the good zone in the shorter gear.

Of course, for doing that I must buy springs and retainers (was thinking in the Brian Crower kit, tho maybe it's not a good idea to mix brands).

Taking that into account, should I buy the Procams instead of the Poncams? I suppose DET ones are ok, since it seems there is no specific Procam for the DE.

I don't want a very lumpy idle! And going 270 deg, 11.5 lift that would be hard to get (though with the procams you can mix diff intake and exhaust cams, since they're sold individually)

Summing up, which cams should I get? (don't tell me s3r's, lol) where would you put the rev limiter?

Thanks a lot in advance, sr20 gurus

Post has been approved. Bumping this up since it's way down the list.

Thanks for approving and bumping it, Vadim.

I've had time to think before this was approved, lol, maybe the Procams are not available for the RR?

My car drinks a lot of oil lately (like 1/3 gallon each 500 miles). I was about to do a compression test.

If all cilinders seem ok, then it will be probably due to the valve retainers (another good resason for changing springs+retainers). Do I have to change also valve guides?

If compression test goes wrong (I hope it won't, car starts fine and no black smoke), problem would be probably caused by piston rings. Having to open the block, if I decided to spend such a lot of money, I would probably go with the sr16ve pistons+ rings route.

Suming up this second post , are the sr16ve pistons a direct replacement for the RR DE ones? any modding needed?

TOMEI makes cams for RR engine. You dont need rev. limiter at 8k or so. RR is different engine than more revving highports. You are fine with stock rev. limiter (which is 7100rpm as i know, not 7300rpm). You dont want to rev a lot with stock valve springs anyway... Brian Crower dont make RR valve springs, i dont know about any brand who makes them. RR peaks around 6000rpm, so stock limiter is totally fine. Proven maky times.
Get Poncams and be fine. About ECU - Nistune make boards for your car and it depens where you live, it can be tuned my local dealer or forum members.

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Hi, jagy.

Love your country. Prague is one of the most beautiful towns in the world!

Stock peak is at 6100rpm and with all the bolt-ons it will be probably a bit higher. I'd like to put my rev-limiter at around 8-8.2k as I think the optimum shift point will be higher than 7k!

I have several choices for RR cams: jwt s3r, tomei poncams, pipercams, cat cams (I've heard great things about these, some uk guy over there?)...

And as, for the oil burning issue, I will buy springs+retainer kit (for either Tomei or BC), I definitely want to rev a lot

Nistune type4 board is a pita to install in the p11 gt ecu, since the damn bosch unit has a stupid frame and needs an adapter and some work to fit it. I've contacted some local tuners and it will be expensive, but hope to get some good results.

What do you think about installing sr16ve pistons? I think I will do it just if oil burnt is due to piston rings and I have to open the engine, changing valve guides and doing some work on the head at the same time.

In that case, what approx compression would I have? 11.6? Does it depend on the cams? Cat cams has some 302 degrees cams! (tho I doubt they would be smooth at idle / ideal for a DD).

Thanks a lot!

Those BABY cams will not make any power above 7k anyway.. hell I'd say you'll even see the power tailing off above 6.5k even.
It's be a waste of you're time and money revving it more.
If you want more revs, Forget the Tomei Poncams... Get yourself some Catcams (they make HUGE RR and non RR cams), and their own valve springs which work with the stock retainers. Certain cam profiles they offer will be more suited to 6k-9k if thats what you're after.
Joe

Hi, yeah Prague is very nice, thanks.

i saw a lot of dyno graphs and all peaked around 6k rpm, even with cams. If you want to rev high, rework you RR to using highport head parts (cams, springs, reatainers, etc.). Its cheap and you have better choice of cams, springs, etc. Or just get SR20VE if you want to rev that high.

As i said before, i dont think BC makes RR springs, not sure about Tomei.

I saw UK guys with Nistune boards in N15/P11 with no problems. If its problem for you, i can help you how to run P10 ecu with Nistune board, which will be probably cheaper to buy and tune. Im using is in one N15 SR20VE and one P11 SR20VE.

SR16VE pistons are fine, it will make CR aroun 12-12.5:1 in your RR which is fine on 100RON fuel.

Dynamic compression depends on your cams, static compression didnt. Friend has these big 302° cams in race Sunny GTi and he never worked out, how to set them and tune them properly. He had to use BC stg3 272° cams after that. For such a big cam, it has to be done much more to the engine.

Just FYI the "retainers" everyone talks about for the valve springs have nothing to do with oil sealing. Those are the "valve seals" that do the oil sealing. These are also different from "valve guides".