Greddy Intake....Please help if you have experience with it

[nismodave]

Ok..so I drove my sr today and I was not very happy....

The motor looks great and runs good after the re-install of the motor....the shop did an excellent job.....but....

I put on a Greddy intake and tubular manifold, I noticed a MAJOR drop in low end, I did not rev the car past 6500.

I have a t28 bb turbo and all the external mods aside from the z32 maf and larger injectors (which I plan on doing soon,I have the parts). The car is exactly the same as it was last year.

Did I make a mistake?

If you have any experience with this intake please tell me what you noticed with performance.

My search on the site noted only rumors of low-range/mid-range loss and high rpm gain.

The car has yet to be dyno tuned but Im not happy right now.

[GraySilvia]

big loss on bottom end...i'm thinking of putting the stock intake back on to really do a back to back comparison, but i don't have an S13 cold pipe anymore, so, i guess it'll wait....however..in the greddy intake's defense, the top end is rediculous, but you really need a rev limit much higher than stock to take advantage of it, mine just starts getting crazy about 7000rpm then the 7700rev limit kills the fun (JWT limiter). And it looks very badass and intimidating under the hood, that's all that matters, right? :)

But yeah, i'm not sure if that huge hit in low end is what i wanted either, but, i'm trying to work around it, perhaps when i get my power FC and actually get everything tuned the bottom end will pick back up some. But if low/middle end is what you're looking for, the greddy intake is not that answer.

P.S. spanking hondas IS fun :ylsuper

[GraySilvia]

Actually, i should point out that it's still pulling HARD at redline...i mean, it pulls hardEST at redline....just to let you know

[nismodave]

Well....I think Im gonna do the mods I have still planned....dyno it with the Greddy intake......then re-install the old one......then dyno it agan.

It seems that not many people have alot of experience with it.

Thanks Gray:)

[martin]

You don't need experience with it, just lookig at the design it's obvious you'll loose low end power. To make low end power you need long intake runners, short ones for high end power. The greddy has little stubs for runners, all the tuning in the world won't bring that low end power back with that intake. Several car thse days use variable length intake runners to resolve just this problem.

Try running a lower gear in the car ie. 4.37, or 4.62, you'll use the revs more and won't notivce the loss of low end power so much... fuel econemy will go out the window though, but you don't care about that.. do you?

-Martin.

[nismodave]

Thanks Martin....

Yea the runners are short, but I didnt think that the dropoff in low and mid power would be that much. I was hoping that tunning will also help.

I dont know where to find gears for a nissan rear end.....heck Im still searching for a vlsd

[Cyberkreig]

Several car thse days use variable length intake runners to resolve just this problem.

Hmm.. Doesnt the New SE-R use a variable intake? I wonder if that is computer controled or mechanical... You could probably pick one up for not a huge amount of $$, a little cutting and welding..

[martin]

Thanks Martin....

Yea the runners are short, but I didnt think that the dropoff in low and mid power would be that much. I was hoping that tunning will also help.

I dont know where to find gears for a nissan rear end.....heck Im still searching for a vlsd

I'm sure tuning will help a little, but not get you back to where you were.

I'm running a 4.636 gear in my KA powered stock car, I got it from http://courtesyparts.com/nismo/s13/s13_4.html but I didn't pay that much for it, I think they cross referenced it to a Xterra front ring and pinion if I remember correctly.

Good luck!

-Martin.

[achilles0t]

keep in mind your only running a t28. that intake manifold needs more flow than from a t28 to be efficient. take the manifold off and run the stock one for awhile when you upgrade the turbo, drive with the stocker for a little while then put the greddy IM back on youll notice the difference. if you dont wanna change it back, get an egt and safc and tune the a/f mixture to make use of all that extra air. stefan

[Projex240]

The variable runner intaks are the operated on vaccum. When the motor hits a certain rpm, the valves (butterfly) swing ope, closing off the set of longer runners, and opening the set of shorter runners, They can be removed and bypassed. Thats whats usually done in the ka motors, when their turbo'd.

[Drakon]

4 sumone looking at intakes what would anyone suggest for a good gain acrost the low/mid spectrum? I dont really know to much about intakes on SR's or other turbo's cars. (sory, u all were noobs once! )

[Cyberkreig]

Projex -- If the Variable runners are vacume controled, there is no reason why that manifold or maybe a spec-v aftermarket manifold (hmm...) cant be cut, welded and made to fit.

[achilles0t]

actually shorter runners will increase torque with the runners being short air takes less time to enter the combustion chamber meaning more air quicker. =more torque.

the greddy is a great design but the engine's stock intake manifold is sufficient to the 12's then worry about it

2nd gen eclipse favor the 1st gen eclipse intake manifold because it has longer runners and a larger plenum which is better for high end horse power. the 2nd gen's looks more like a honda's with short runners and a plenum the size of a sweet patato. greddy gave us a larger plenum but kept the runners short. power is never about what parts u have on the car its how u use them.

[pampadori]

actually shorter runners will increase torque with the runners being short air takes less time to enter the combustion chamber meaning more air quicker. =more torque.

the greddy is a great design but the engine's stock intake manifold is sufficient to the 12's then worry about it

no, you are wrong. short runners make torque, but its in the upper revs.

shaun

[achilles0t]

lright mister if im wrong prove it. you seem to not have a lot to say on the subject so please respond with some infinite knowledge. and u only responded to half my post

[pampadori]

Well, look at the variable intakes on oem cars. or the schreek or however you spell it...for the vw's. they start out with more volume, or longer runners at low rpms. then they shrink down to shorter length at higher rpms. i don't know why, but i just know that that is how it works. :0)

individual throttles also kinda show this...they are very short runners. and they make for a great mod for top end gogo.shaun

[ImportIntelligence]

My Greddy manafold came with a dyno chart in the instructuobns and it said that all your gain was going to be above 5800 and did show a loss at low rpms. I have my head ported and the greddy manafold port matched to the head. With this setup there is little torque down low. I also run an HKS drift cam ( to make up foir the loss in the low end. ) Still the car runs like a 2 stroke engine. no power down low and then someone turns on the lights at 5200 rpms right to 9000.

----------Sr20det

[I H8 UR DSM]

your reving to 9k matt? lash killer kit?

[nismodave]

Jez....I thought this thread dies a long time ago....

Well Im keeping it on, and Im having my ecu reprogramed. Its being reprogramed by Enjuku, and the timing is going to be bumped up in lower RPM range to make up for low end loss of power. THe rev limiter is being set to 7500, and it will accept a z32 maf.

[ImportIntelligence]

Jesse, I do have the lash killer kit, valve springs, retainers and stainless non-solium filled valves. (Mines ECU)