Tomei M7960 built engine dyno

[QuickSpoolSR]

I have an s14 sr20det that I just recently had the engine built (stock bore cp pistons, manley rods, acl bearings, bc 264 cams springs and retainers) I have 750cc five-o injectors, and the tomei m7960.

The reason I am posting is becuase I was expecting much lower numbers than the shop just told me they were getting. at 12 psi they said im getting 360whp... does that sound right lol. they tried to do 15psi but my exedy clutch started slipping at high rpm so they turned it back down, the engine is fresh so they said the 12psi will be good for break in. Just seems odd to me because people don't usually get those numbers out of that turbo unless they push a lot more boost.

I will be getting a dyno sheet at 12psi when I pick the car up, its 6 and 1/2 hours away so I need to figure out my schedule but hopefully I will go get it this week.

Any thoughts? I'm very excite!

[Calenton]

Well whoever built your engine did a good job you must be getting excellent volumetric efficiency. On top of that the ARMS turbo is well within its 75% efficiency range at 12psi at that RPM range to make that kind of power...I believe it :cool:

[whitenoise]

That's good to hear. Also I'm sure Ur cams had a lot to with the power output Ur having. I have the 8270 on my s14 Sr right now and I'm a it apprehensive to go at it since it's bone stock long block. Congratulations

[NAIRB]

I would say the dyno reads a bit high, on 12psi with cams you should probably be around 320whp


Here is a similar setup just without cams

http://zilvia.net/f/engine-tech/467258-positive-results-tomei-m7960.html


What are you using for tuning? iirc that dude was running nistune with a conservative tune.

[racepar1]

Dynos are just for comparison when tuning. You cannot take whatever numbers they throw at you as fact. Dynos are notoriously inconsistent from one to another. I have heard of some that are known to read 50hp more than what others do. Also, ESPECIALLY on a turbo engine, atmospheric conditions are key. You can get major differences in power from one week to another specifically from barometric pressure and humidity changes.

All it means is that they seem to have put together a pretty good engine for you. Take it as no more, or no less than that.

[QuickSpoolSR]

a power fc l-jetro with a z32 maf.

I will post up the dyno sheet when I get it.

[DJ-of-E]

Dynos are just for comparison when tuning. You cannot take whatever numbers they throw at you as fact. Dynos are notoriously inconsistent from one to another.

Just to make notes, one of my engineer friends work for a company that purely calibrates systems, such as the dyno @ porsche in Los Angeles, and it costs $45,000 and 3 days to fully calibrate the machinese to percise numbers. Not only that, it supposed to be calibrated every 75 - 100 runs due to component wear, but I'm pretty sure no shop would want to do that.

Racepar1 is also right that turbos are sensitive to atmospheric conditions.

[jorge1190]

What kind of Dyno is it also?

I would say you are closer to the 300-320 range, 360 sounds too high.

[gretz]

Too high, or disneyjet... Post your chart, how quickly does it spool?

[QuickSpoolSR]

I am picking the car up on Thursday will update then with a dyno sheet, I don't know how fast it spools or what kind of dyno yet

[racepar1]

Too high, or disneyjet...

HAHA! I haven't heard that one before. I like it!

[wh0aitznic0]

disneyjet or not, this gives me much hope. :)

[InsTanCeZ]

M7960 FTW. It's made by Tomei so it's automatically the best.

[dreadedfist]

Dyno local to me said my r32 gtst was making 162 at the tires when I bought it. For shits and giggles I tried another dyno, and it said 190. It was pretty much stock at the time. Instead of looking at the total numbers output, look at the level of change before and after another round of mods are done and tuned for. Then figure out trap speed either on a track or using the Gtech quarter mile thing to get a better idea of actual power output. To many people focus on dynos as an infallible number generator, instead of what they are, a tuning tool with about 100,000,000 different variables.

[Hoffman5982]

I plan on buying this turbo in the near future. Anyone know what I should expect with a stock longblock, PonCams, injectors and Nistune? I'm assuming I don't need to exceed 18psi?

[QuickSpoolSR]

I want to hit 20psi eventually maybe after 10k miles or so, idk how long of a break in period there is.

also im 90% sure its a dynojet or disnyjet lol

[jorge1190]

My break in period was the Dyno:

I am on a Top Mount 60 trim making 372 on 15 PSI on a "Disneyjet"

I think if any dyno should get that name it is a "DisneyPack"

[QuickSpoolSR]

ill probably at least get it home and run a cycle of synth oil through it, and change it again before I start pushing it

[oligator20]

Do you guys run with the stock wesgate? You can hit 20psi without any problem?

[InsTanCeZ]

Stock wastegate should be good for up to 30psi theoretically.

Edit: Sorry probably more like 23 psi.

[QuickSpoolSR]

So I found out I was at 320 on 12psi and 360 on 15psi.. sorry I forgot to post the dyno sheet I will grab it out of my car on my lunchbreak

[QuickSpoolSR]

here is the dyno below let me know what you think, it feels kind of sluggish until 4k, idk if that is because I am not used to a bigger than oem turbo or what...:

http://i654.photobucket.com/albums/uu268/johnw14151/Publication5_zps8c9e4aa9.jpg

[QuickSpoolSR]

also the little swirl he said is my clutch slipping, I have an exedy stage 2, and am gunna have to upgrade now :(

[QuickSpoolSR]

ya something definitely must be up because after looking at other m7960 dynos they are over 300hp by 4k, on the same boost... I wonder if my vtc isn't working or something?

[NAIRB]

do you have a dyno sheet with the boost on it? it looks like your wastegate might not be staying shut all the way an not letting you spool up as quick as it should

[japslapsilvia]

do you have adjustable cam gears? i know the BC cams tend (well i have heard) to be "out of centerline" with the dowel pin since they are designed for the FWD SR motor?

[NAIRB]

^ That does happen with bc cams, but even if they were off from center line it should not make that huge of a difference in spool time. That dyno makes it almost look like he is making linear boost x rpm like a centrifugal supercharger.

He seams to be missing a huge chunk of power around 4.5 - 6k

It also should be making peek tq once it reaches full boost, which should be around 4-4.5k, not peek tq at 5.5k.

[QuickSpoolSR]

Well I plan to replace my wiring harness with a wiring harness specialties since its been in several different cars and its kind of a hack job, i am also going to replace the clutch, i don't know if a slipping clutch would make it look more linear, maybe the hp was trying to spike up around 5500 cuasing the little blip, i don't know. I am also going to replace my vtc gear and solenoid because i am getting that rattle noise.

let me know what else i should try

[S13onabudget]

M7960 Awesome turbo. Just installed mine onto my redtop last weekend with supporting mods and an enthalpy tune on my ecu. Running the tomei factory pressure .8 bar. Just a bit laggy until 4k. Now i want to throw some cams to increase the power.

[NAIRB]

A slipping clutch would not make it look linear, the graph would not be smooth at all, you would see more weird blips wherever it is slipping like it does at 5500. Also that blip at 5500 is because that is where peek tq is and it's most likely to slip.

And how is your idle, is it very rough/lumpy for 264's? because if it is, your vtc could be stuck advanced causing a lot of overlap which would hurt spool alot. Either way if it is making that rattling noise it's a good idea to replace it.

And if you could get a graph of the boost it would help a lot with trying to figure out where the loss of power is at. Because if you are making full boost by 4-4.5k then it has nothing to do with the turbo. If its not a wastegate problem, or vtc problem, your exhaust cam could also be off centerline an you would need to get an adj cam gear and degree it.

[QuickSpoolSR]

A slipping clutch would not make it look linear, the graph would not be smooth at all, you would see more weird blips wherever it is slipping like it does at 5500. Also that blip at 5500 is because that is where peek tq is and it's most likely to slip.

And how is your idle, is it very rough/lumpy for 264's? because if it is, your vtc could be stuck advanced causing a lot of overlap which would hurt spool alot. Either way if it is making that rattling noise it's a good idea to replace it.

And if you could get a graph of the boost it would help a lot with trying to figure out where the loss of power is at. Because if you are making full boost by 4-4.5k then it has nothing to do with the turbo. If its not a wastegate problem, or vtc problem, your exhaust cam could also be off centerline an you would need to get an adj cam gear and degree it.

Its going to be a little while before I get it on a dyno again, yes at idle it kind of feels like its missing a little its a little rough too, and it was doing that before I had it rebuilt

[gretz]

Isn't it odd that no-one posting, or anyone I know for that matter, is making "near stock spool", or even close using these turbos?

I have a buddy running 18lbs, even went externally gated / welded the IWG because the spool was no-where near advertized > no difference, these things are shite, which turned me away from them for my 1jz vvti setup (thank goodness lol)

[gretz]

Just looked at their test chart and compared yours...

They have boost starting to come on at ~2000rpm, full boost by 3500rpm
Tomei claims 190hp @ 3000rpm, you have under 50hp
Tomei claims 240hp @ 3500rpm, you have about 75hp
Tomei claims 320hp @ 4000rpm, you have about 175hp

C'mon Tomei, WTF

[Baggy]

Just looked at their test chart and compared yours...

They have boost starting to come on at ~2000rpm, full boost by 3500rpm
Tomei claims 190hp @ 3000rpm, you have under 50hp
Tomei claims 240hp @ 3500rpm, you have about 75hp
Tomei claims 320hp @ 4000rpm, you have about 175hp

C'mon Tomei, WTF

isn't theirs used on a 2.2L Stroked SR motor?
with Pon Cams and supporting mods?

[tricky_ab]

isn't theirs used on a 2.2L Stroked SR motor?
with Pon Cams and supporting mods?

Correct! There are more supporting Tomei bits that were added to the mix...

[gretz]

Ya, and this guy has a fresh build and a built head... That .2L is not going to make that difference, I don't care how you look at it

https://www.google.ca/search?q=tomei+m7960+sr20&espv=210&es_sm=93&source=lnms&tbm=isch&sa=X&ei=EemDUsbhE-OgigLe_YCACw&ved=0CAcQ_AUoAQ&biw=1163&bih=839#facrc=_&imgdii=_&imgrc=LAsN9lQbSeo9DM%3A%3BJF-qlcPmwWKNTM%3Bhttp%253A%252F%252Fwww.zshop.ca%252F wp-content%252Fuploads%252F2012%252F01%252FTomei-M7960-Turbocharger-Nissan-240SX-SR20DET-89-98a.jpg%3Bhttp%253A%252F%252Fwww.zshop.ca%252Fpart s%252Fs13-tomei-m7960-turbocharger-sr20det%252F%3B280%3B382

Here is a stock making more power at 3000rpm than the first... Not a great representation

[QuickSpoolSR]

I wouldn't blame the turbo just yet, I have been talking to the enthalpy dude, he thinks it could be my vct too, I mean the bottom end feels the same as it did before the build, I am hoping its a wiring issue, because I am replacing the harness anyway very soon. and after the vtc is supposed to be off is when it feels like it should, (after 5k or whatever).

[QuickSpoolSR]

I just read that the intake cam gets advanced 21 degrees, if my solenoid isn't opening, that makes sense that my midrange is gone, that's a lot of timing

[NAIRB]

^ yup pretty much, if it is advances 21 degrees that would be a shitload of overlap. Could you post up a vid of the idle, I would like to hear what it sounds like compared to other cars with 264s.

[carlos-s14sr20]

http://i1127.photobucket.com/albums/l639/CarlosOrtiz19933/20131113_185230_zpsc4a3b695.jpg (http://s1127.photobucket.com/user/CarlosOrtiz19933/media/20131113_185230_zpsc4a3b695.jpg.html)

@ quick spool this is my redtop sr20det with an m7960.
m7960
B/C spring and retainers
rockerkeepers
pbm hmic
full exhaust
z32 maf
sard 550 injectors
factory bottom end
i made 325 hp on 17 pounds of boost

[QuickSpoolSR]

http://i1127.photobucket.com/albums/l639/CarlosOrtiz19933/20131113_185230_zpsc4a3b695.jpg (http://s1127.photobucket.com/user/CarlosOrtiz19933/media/20131113_185230_zpsc4a3b695.jpg.html)

@ quick spool this is my redtop sr20det with an m7960.
m7960
B/C spring and retainers
rockerkeepers
pbm hmic
full exhaust
z32 maf
sard 550 injectors
factory bottom end
i made 325 hp on 17 pounds of boost

looks pretty similar actually haha

[carlos-s14sr20]

hope it helps a little, i could have made a little more power but i ran out off injector.

[gretz]

Lol, im not making this shit up

[QuickSpoolSR]

that sucks lol New goal is to get a gtx2867 and shoot for 400whp on 18psi with better response...

[QuickSpoolSR]

first the harnss vtc gear and clutch.... the never ending 240 broke game lol

[gretz]

I have no idea why no-one has contacted Tomei...

Its false advertising as far as i'm concerned, using shitty dyno charts (if you want to call them that) to tell you your car is going to spool uber fast, when its nothing remotely close.

[QuickSpoolSR]

lol I would be happy for a refund so I can put it towards the gtx haha

[gretz]

Did you contact them? Im interested to hear what they have to say