been looking at different dyno's of turbo 4th gen's and wondering about the power holding till redline with the stock manifold.

The dyno of the PFI kit with the TO4e show a significant drop in power after 5.7K rpm's or so. http://www.turbo-kits.com/images/pfi_maxima_dyno.jpg

Bags dyno with his T4/T3 seems to hold power better after 6K rpm's.
http://216.77.188.54/coDataImages/p/...45454run50.JPG

I thought that the turbo would over power the charectoristics of the stock manifold and allow power to hold steady at higher rpm's like Bags does. Or is it a matter of the turbo specs that allows or does not allow power to hold up top?

 

T04e chokes at high rpm?

 

Maybe we could get icy to post up the .run files overlapping, that way we could see exactly how much difference there is.

 

The TO4e is only running 4psi with STOCK exhaust vs. Bags 10psi with 3" catback and high flow cat.

 

How many dyno files do you have?

I, we, need to come up with some good overlays... like what mishap did

 

None really for FIs.

 

I guess mishap has themm all..

I thought you had mine, jay's, stephen's, ian's, and a few others.

 

Exhaust differences. Also bags don't you have MEVI?

 

Your stock manifolds should be fine for our applications.. Exhaust housing size and impeller size/effeciency will all dictate when and where power comes in or drops off with all other tuneing factors being good. I hate to keep bringing Grand Nationals into the picture but they use 1 1/2 mild steel basic header that isn't the best flowing design on earth and they still run 10's and 9's with stock exhaust manifolds!
Using somthing other than stock on Maximas is just overkill!
Concentrate more on correct sizing and pipe flow to the turbo and down pipe along with tuneing.. That's where it'll make the difference. Once again.... GN's have alot of turbos that'll be great for our cars!!! The setups are already figured out.. no guess work... Ok.. I'm off my soap box..
~Scott

 

NOT INSTALLED






I do have one, just not on the car

 

Define stock and Intake or Exhaust Manifold

Noted in the stickies.. along with exhaust size

Not really apples to apples

When was the maxima turbo stock????

BTW, this does not look stock... http://gmhightechperformance.com/features/0503htp_tr/


Looks HOT and I'd LOVE TO OWN IT.. but not stock

 

Were these both PFI kits? Exhaust pipe routing could have a major impact on it as well if the routing differs between the two kits. Also Boosted Maxima there is an 87 GN for sale in kalamazoo for $7,000 just thought you might like to know.

 

no on the pfi kit.. at the time of the dyno, I am going to call it custom.

 

Thanks for the input. Just wondering if my power will drop like that. I sold my MEVI and hate to spend the money on another one or a 00VI. Guess I will know once I dyno

 

Too many differences in those two setups to compare them. In general, the larger the turbo, the further to the right (higher RPM) it will push the power curve. This goes for turbine and compressor sizing both. That's why 3L supras with 70 and 80 and 90mm turbos don't make over 200whp until 5500rpm but then they have like 800hp by 6500rpm and it stays up there til redline at like 8k.

 

Bags: I'm using the GN's because they are V6's they are similar in displacement and the stock GN engine isn't as effecient as ours. Especialy your VE's Stock-VS-Stock I'm talking. Not the stage 2 setup on the link you sent me. That car will see easy mid to low 8's with that setup and make many passes after that. Stage motors in the GN's are a totaly different animal than the stock 3.8.

I was just trying to make the point that the stock Maxima exhaust manifold/header is fine for turbocharging. No need to change. I've got almost 10,000mi on my turbo setup now and not a leak! That's with 199,120mi on the stock engine and gaskets running 12psi of boost on pump gas.
Now if we were talking little Honda engines and trying to put GN parts on them I'd say no.. definatly not apples to apples but VE,VG and GN... very simialr. I'm not swaying there... worked on both.. and they respond very similar.
Neloc.. That's not a bad price for a GN but I've got all I need right now
If I ever sell the Maxima.. The Supra would be my next choice. or to put a supra engine in a Lexus 400 4door car. I just like the extra room.
~Scott

 

The biggest impact on the turbo application is the 3 inch exhaust. If you dont have a 3 inch exhaust you choke the turbo. A small AR on top end chokes the motor out. It makes alot of sense why Nigel went with a .81 AR. That may explain some of these dying ponies on top end.

 

The t4 does choke a bit in higher rpms. Ive notice on the highway. Feels better after shifting.

 

I agree 100% on the exhaust manifold. And the main reason for the link was to say I respect GN's. I love them.

Thanks for clearing that up

 

I am really surprised that the PFI kit made 270hp on 4psi and stock cat-back. I thought I would be at 270 or less with my 5.8psi spring. My exhaust piping is the reverse y-pipe set up with the same turbo as the PFI kit, but I will have my 2.5" Greddy cat-back and 3" test pipe. Maybe I will be close to 300hp with the 5.8 spring?

 

SAE + CO = big dyno numbers

 

Good point

 

I have the numbers but they're all on my office computers. I'll zip them for you guys tomorrow or something.

3" exhaust/test pipe makes a huge difference. Shadow's car made 40+ hp and 40ft-lb torque w/ wastegate regulated boost.

Shadow is running as big a compressor as almost any other Maxima and his car doesn't make a ton of power in the high end w/ the OEM manifold. It might have a little to do w/ the T3 turbine but it's a pretty big A/R to compensate. Even so, a short runner big port manifold would be much more ideal for a FI. The VI out of either generation isn't really ideal either since they introduce a whole new dimension to tuning along with significant losses in the low end.

 

Thank youmishap..

 

I don't know, I have always thought of the low end MEVI loss almost like traction control for a turbo Max. I Hear from boosted guys all the time that 1st gear is almost useless on the street. The only time the low end loss is really gonna hurt is in 1st gear since the up shift in a 4th gen maxima lands above 4.5K. On slicks at the track is when it would be nice to have all the lowend power possible since a preped track and slicks is about the only way to get traction while WOT in 1st. If I had an MEVI when I get my turbo on I would probably just remove the butterfly valves completely. MEVI activation would be one less thing to worry about and the tires are just gonna spin in 1st anyhow so 10-15 lbs of torque is not gonna make a diff.

 

MEVI... is that a VE thing? Or are you talking about the intake tuneing valve that's on the VG's ?

Slicks... Yikes.. I'd break my CV shafts or tranny for sure launching in first.. If it'd just hold up for one pass I"d be excited.. I'm proably going to get some ET streets for the stock 15" rims and give it a try down at 41 dragway this year.. just to see what real world times it runs..
Bags: Yea.. GN's are awsome.. My wife's car will be done this spring 86 T-Type Midnight Blue Not a race car but it'll tickle the 11's prity easy. I'm sure she'll want it faster in a few years. She actualy got me into the GN world!
~Scott

 

Mishap - is there any reason to believe that the loss of lowed with MEVI would be any greater than that of an NA car? NA cars lose about 10ft-lb, no big deal, brings me to what mike said.

Mike - I had never even though about removing the butterflies entirely... i might have to get another MEVI and do that. Would open it up bigtime up top, reduce wheelspin down low, and nitrous backfires through the MEVI might not be a problem either. Really wishing I hadn't sold my MEVI now...

Boosted - MEVI is the factory VI for the 4th gen which came on maximas in the middle east. Also as far as slicks are concerned, I don't know how strong the 3rd gen axles are but there are 4th gens and 5th gens pulling 1.7 60' times on slicks and not breaking things so you might be ok. Also I've been to us41 dragway before we should hook up and head there sometime. They are even open all winter!

 

http://forums.maxima.org/showthread....ighlight=GT35R gives an indication of difference at top end between variable intake activating and not activating at the top end.

 

Where???????

 

I found this site that sales upgraded Axles. You just have to give them a call.
http://www.driveshaftshop.com/NissanPage.ivnu
Scoll down to the bottom

 

Wow nice find. I am emailing them right now.

 

Nealoc187,
thanks, I'll probbly will be giving them a ring as soon as i finish my turbo setup. Let us know what happens once you get a hold of them. And also ask them what kind off power it can hold? Thanks

 

Here's the zip of most of the peak runs I have. There are dozens more but they aren't exactly organized in any way. I never got around to sorting them so there are tons of aborted runs and even some lower rpm range fuel tuning runs mixed in.

http://www.evolution-autodesign.com/mishap/dynoruns.zip

As for the MEVI argument, I don't have any 4th Gen MEVI run files to do a direct comparison and the closest thing I have is a run of Y2Kev's car and Shadow's.



Shadow's running a USDM manifold versus Kev's 5th Gen DE-K. Kev's car is also running about 2-3psi more IIRC. Since the DE-K outperforms the MEVI in midrange, I believe there would be a more noticeable difference in torque. You can also see how badly the top end is affected by the USDM manifold. Also, remember Shadow's car is an automatic so the numbers would be a few % higher all around through a manual. The turbo setups may also affect the curves but Shadow is running a relatively large compressor for big top end and a .82AR turbine to make up for the T3 turbine. It's also a relatively inexpensive sleeve bearing turbo so going to a Garrett GT30R would fill out the low end even more.

 

I got my axles here and never had any problems with them. About 1st gear in a turbo maxima yes it is useless and your shifting to second almost instantly but get some good drag radials(I have the BF Goodrich g-force T/A) and definitly invest in a LSD I prefer Quaife and you should be okay. Tranny will hold up for a little while depending on how many miles are on it and how aggressive you drive.

 

t70max95,
So you got your axles from them? How much did they say it could hold (HP)? And thanks for responding.