I have a gsr with bolt on/stock block. I have Blox Type C cams and had it street tuned. He set vtec at 5300rpm and it seems like something is holding back when engages. I think vtec is too low because it feels like it pulls normal at 6300rpm. Just wondering anybody running these cams vtec is set at?

 

Hi, I run Blox C's too, It's not the engagement point it's the fact that when VTEC engages it Runs Hella-Rich for 200rpm or so. All small Primary/Huge VTEC cams have this tuning habit.Didn't your tuner have a Wideband ? Does it Happen at Full Throttle too ?

 

It ran too rich when vtec engage. We had to put more fuel on the lower rpm and take fuel out up top.

 

Yes he had a wideband to. Maybe could be just my tuner tunning. Gonna have anothr guy street tune again tomorrow.

 

Yeah I have the same cams as well, Its like hitting a wall when vtec kicks in..I have mine set to 6100. What injectors are you running. I'm putting some rc 440 in this weekend. When I hit 5800 my injectors max out. But my build is diffrent then yours.
I have this:
gsr block with ls crank, eagle rods, pr3 pistons, ge oil plugs, 3 layer gasket they shaved
.010 on the block.
b16 head with blox s&r blox type c cams, skunk2 cam gears, itr intake , 68 mm tb
gsr tranny, exeady stage 1 clutch and 9.5 flywheel.

I had DDtech street tune it, runs good till I hit vtec..lol
did you degree your cams, if so what -/+

 

Nice I did that same ls into gsr. What's ur compression?

 

Im at 11:6:1, that was what I was told at my engine shop. But everybody keeps telling me its more like 12:3:1 looking at zeals its 11:6:1. What was yours at, what kinda cams did you have and injectors?

 

I'm running 310cc RC injectors. My injectors still running 80% duty cycle..I have plenty. Fuel pressure is set at 40-45psi. And yep mine is like hitting a brick wall when vtec kicks at 5300rpm. Seems to pull normal around 6200rpm.

 

My build is:

Stock Block

Head: Blox Type C, supertech springs, sk2 68mm TB, sk2 manifold, ebay header, spoon catback, sk2 cam gears at 0, 0 settings.

 

Does it Happen when you are going through Vtec full throttle ?

 

Both..Full and half throttle. As long vtec is engage. Even the tuner said something is holding it back.Vtec pops loud but its not pulling. My gsr cams runs better lol...

Anywyas getting another street tune by different tuner. See how that goes..

 

Thats odd. I installed a set of Type C's in a Ls-VTEC with pr3 pistons, ported head, old Skunk2 intake mani, 70mm, Alpha header, 880cc injectors on e85 and a customs made air intake tube with velocity stack. Made 203 whp on a Mustange Dyno. Vtec kicks like a mule!

 

Damn video won't show. How do you guys post vids?

 

If it Happens at full throttle too either the Tuner is incompetent or something else is wrong i doubt it though.I Bet AF hit's high 9's . On my car we just leaned it out and added some timing and its Completely gone on Half/Full throttle, A tiny bit still remains when below 1/2 throttle.

 

I asked the tuner if he can move it up but he said he can only a bit and not to 6k rpm. I ask why, he just said its complicated to explain. Maybe he didn't want to mess with it anymore idk. That's why i m getting a different tuner.

 

OP, if you have a wideband, make a 3rd gear pull from 2k - redline, Email me the cal / datalog to Derek @ DDTECHCAMS.com

I'll be happy to take a look at it.

As far as Jargon's issue, its as good as its gonna get with me being 400+ miles away, because i'm not there to experince the issue. Every issue is different, the Blox C's are mostly compared to the JUNIII's which like vtec anywhere in the range of 5200-5800, depending on supporting mods. Hitting a brick wall is mostly caused by either a too rich condition, vtec incorrectly set and/or the mods aren't working well and cam timing needs to be adjusted.

 

I run C's in my lsvtec. Had it dyno tuned, vtec kicks in at around 6k and pulls even harder. No wall whatsoever.

There was however a wall like you explain when vtec kicked in before I had it dyno tuned though.

 

DDTech, on the next street tune I will try to email u that if It doesn't run right. Thanks.

 

isnt that gettin pretty far up there in rpm and putting a good amount of stress on the lma's?

i bet the "wall" is a too rich condition. i was going through that a little bit when messing with intake manifolds and cam timing on my lsvtec. had to pull a chunk of fuel out for around 500 rpm after vtec engaged. after that vtec engages smooth with just a slight exhaust note change, then the powerband from the cams really comes in a little bit after that

 

I dunno man, I thought so too. I have a 00 type-r trans with a high final drive so it helps with staying out of vtec though.

It might be because it was just a quickie tune. Only an hour. I can't complain though with 201whp. Whenever I get my finances together I'll get a more thorough tune.

 

I normally don't set vtec above 6400rpms, that's touching the limits of the LMAS ability to "keep up"..

IF you have to set vtec really high, the motor can't breath...

Hitting a wall, is normally a rich condition, like I stated early, or something along the lines of cam timing...

 

I thought 6k was kinda the "standard" rpm for aftermarket cams to engage? **** when my B16b was stock, it engaged @ 6k even. I understand that you want to set it as low as you can while maintaining a smooth cross over, but isn't it common sense that if it bogs at a certain rpm - you need to increase the rpm until smoother transition is achieved? I'm no tuner, but this seems pretty black/white to me.

DD are the newer style lma's anymore efficient in rpm than the older style?

 

According to zeals calculator mine is at 11.8:1, I had stock gsr cams. Yea I had someone tell me also I was at 12.cp also

 

O i have accel 255cc low impedence injectors

 

I can tell you this. Derek at DDTech is bad ***, my car ran like **** until he street tuned it for me. I highly recommend him to check out your tune and tune it for you. It was easy just a few data logs and emails then bam running good.