I'm not trying to hate, I think it's a great car and I'm sure your tuner knows what he's doing. The setup looks super clean. The numbers however are wrong, maybe he doesn't know it but they are. It's not even in the realm of possibility. I have as you brought up seen some of Mase's numbers that were higher than most likely possible as well and many that are about as expected I think that's a result of him tuning on so many different dyno's (how could he know what corrections are built into other peoples dyno's).

Joe, your example of how a 35r can make the big power comes from a dyno jet on STD correction which is not the standard and happens to be the highest of all the correction factors.

Do you really think there are "freak" fuel pumps that happen to flow almost 200 more horsepower on the same car? That's pretty much what your claiming since like you I see about 550 before issues on a dyno jet with a single walbro. The OP is claiming 650 on a dyno dynamics (720+) on a dynojet surely you don't believe this is possible with either the walbro or the 35R?

For reference:

https://www.s2ki.com/forums/index.php?showt...&#entry16750599

How could a car with a 4088R 1.19 housing, equal length tubular manifold, custom, intake manifold, no filter, 4 inch exhaust, no ac, and running on alcohol run the same boost pressure and make less power than a car with a 35R and a street setup on a dyno that reads about 12% lower.

You can say it's all in the tune but what are the chances that I have $10,000 in engine management computers, and $3000 in sensors and don't know how to use them at least up to par with the capability of an AEM. My car has over 50 hours of dyno time and every cylinder is tuned as it's own engine.

I usually know better than to say something in threads like this but every once in a while one comes up that is just way to far out there to pass up and I can't let it go. It's a bad habit but it's a pet peve and it eats at me when I see these threads hang around the top of the FI section. Then when truly honest tuners or people that make normal numbers post up they are ignored because they didn't do something "amazing"

The truth is unless you are truly clueless you will be within 10% (and even that would be pretty sad) of maximum power for your given setup when tuning WOT.

 

 

nice set up you have going on there. yea like i said, the fuel pump is what seems questionable about this one here...

i had a 4088r set up on this same engine combo, and it only made 675, and it took MORE boost to do it. i have been very dissapointed with the 4088.

again, with the same engine set up....removing the 4088 with NO other changes and putting on a 4294 the car made 859. the 4088 is just not all its hyped up to be IMO.

as far as the correction factor on the dyno goes......obviously temp etc makes all of the difference on that....i'll check and see what the sae and uncorrected numbers are. its probably still really close.

and i totally agree the tune makes it safe and reliable. the set up is going to make the horsepower.

at what point in the exh system are you monitoring ex pressure, next to the 02?

motec rules

 

Very Nice Number!

 

Actually the "exhaust manifold press" and "exhaust press" are both measured at the turbine inlet. It's a twin scroll so I have one sensor in each scroll. The only reason the channel is labeled exhaust pres is that I use that channel in 3 different components on the can bus and if I rename it it adds a lot of complexity for no reason.

I have had one in the downpipe just to make sure I don't have excessive pressure but from a tuning and reliability stand point a sensor there is useless unless you are under water or someone stuffs a grapefruit in your muffler it really doesn't change all that much.

I totally agree about the 4088R, from what I could tell it seems to be derived from a diesel truck turbo and doesn't appear to be as performance oriented as most of the Garrett product line. At a quick glance I saw multiple things I was disappointed by that point towards it being a production type part.

 

ah gotcha, i figured you had something like that going on as the pressure was too consistant with emap in the manifold.


yea luckily we can all fit a pretty decent downpipe/exhaust set up on our cars, so the exhaust pressure is not much of an issue.

ever monitored AFR at the tail pipe, and at the downpipe on a car with a restrictive exhaust (as in flow, not a cat etc)? can see a pretty substantial difference in AFR due to the pressure. thats one of those un-typical deals...but can def. build comp tables based off the exh pressure in those situations. we dont ever touch anything with smaller than a 3" downpipe for the most part, so we never really have to worry about it.

i want to put my motec ecu on my s2000 really bad......but i cant justify it as i drive it every day and the ECU is pretty much worth more than the car lol. i could care less if the car got stolen, but i would be devastated if the ECU went with the car!

 

I can do a plug and play setup with an M400 (no options enabled) for about $3,000 but the truth is unless your going to spend about 5 (options, sensors, etc) and spend at least 10 hours tuning it you could accomplish the same thing with an AEM (or whatever your ecu of choice is). The way I justify the cost is I spend a ton of money on parts and a ton of time on my car that I will never get out of it. If I move on to a new project car, boat, truck, bike, plane, helicopter, robot (lol) I can take all my electronics off and take them with me.

If you have a really well built motor (say 10k in it) then an SDL and SLM (dash logger, and shift light module) are well worth the investment as well... I need to start a thread about the MoTeC stuff and try to bring around some awareness. I feel like if more people knew the capabilities they would be willing to pay for it. It's worth every penny.

 

ive said it a thousand times.....i have spent tens of thousands of dollars on my cars over the years...and i have never spent money that i felt was as "well spent" as my motec ecu

i purchased a M800 for the fact it came with a lot of the options with no "upgrade" cost....but primarily because it will work on any car/robot i want it to work on lol

i figure i could have 3 cars if i wanted, loom each one, and just pop the ecu from car to car. 8cyl car is next in line for me

 

I do the same, I have 2 cars I use it on all the time. I have considered putting it on a jetski and four wheeler I have just for laughs but don't want to damage it doing something stupid. I also use it for an injector flow bench

https://www.s2ki.com/forums/index.php?showt...&#entry16080082

 

haha i remember seeing your set up over on the motec forum

one of these days im going to build myself a bench to just hook up and be able to actually watch everything and see what settings in the computer are causing this and that to do whatever it is it does. im 100% a visual learner so i think it could be super helpful. just never seems to be enough hours in the day

i bet you learned a ton from the bench you set up there, thats awesome