Dyno Runs With Headers....finally

[rsiwicki]

[rsiwicki]

2nd run.....a little heat soak I guess

[rsiwicki]

they said my AF ratio was right on target and could be only a little bit leaner, but nothing significant to give me any extra power.

The little blip around 5,750rpms in the first run is where I have that funny TC lock & unlock thing going on that we discussed a year ago where we came up with no real explanation of why the car does this, but the dyno shop said that they saw it on a new 350Z also.

The numbers are great and a huge improvement over stock. As I have said and those who have driven my car...the car pulls really strong from 4,000rpms all the way to 7,300rpms without a hint of letting off. I am putting down the same amount of HP at 4,500rpms as I am at 6,900rpms. I got many cheers and the Q earned a new found respect from some little ricers at the numbers. Even if the dyno is not properly calibrated as per all the various factors that can affect the numbers...I don't think that you can dispute the almost flat HP curve all the way from 4,500rpms till redline. I guess this explains one of the reasons why the car is so damn fast from 90 to 135mph....because of the flat HP curve.

And in reference to AGM's headers from Australia, I believe that we are both seeing similar "net" gains with the addition of headers. Through my conversations with him, he also said that he feels the extra HP all the way to redline and he stated net rwhp gains of 40rwhp. I think that I am right about there seeing close to the same net gains. I have a very similar setup to AGM except for the design. He has a 3 into one type header setup with a H-pipe mandrel bent design and I have a more equal length (not perfect) setup with a X-pipe mandrel bent.


Modified by rsiwicki at 8:08 PM 3/24/2005

[elwesso]

All you gotta do now is rotate the pictures so my neck doesnt hurt so bad.....

Looks real good.. 298 HP (is that supposed to be RWHP???) is really stellar... Those headers is what is making your car so leathal... its your secret weapon... I must obtain these!

[1qckser]

Rob that is sick, 289 plus the %20 driveline loss puts you at 346 flywheel hp, and the tq is whats really nice, congrats .

[nissanforlife]

All you gotta do now is rotate the pictures so my neck doesnt hurt so bad.....

Looks real good.. 298 HP (is that supposed to be RWHP???) is really stellar... Those headers is what is making your car so leathal... its your secret weapon... I must obtain these!

my neck hurts too... lol...but besides that...

NICE NUMBERS!

who made your headers.. how much would it be to get or replicate?..

i want to get head now more than ever before....

[pito11213]

damn those numbers are impressive. Your Q is a monster then. You have probably inspired many now that you have real world on paper results.

[John Dixon]

Excellent, looks like it should be possible to replace my 351RWHP VG30DETT with a sorted VH45 and get close to the same performance with a bit of work.

[szh]

Hmmm ... not to rain on your parade here, since these are great numbers, but shouldn't the hp-torque numbers cross at 5200 rpm? The first curve is off by a lot although the second is closer. Was the system properly set up and calibrated?

Z

[Black95Q]

Hmmm ... not to rain on your parade here, since these are great numbers, but shouldn't the hp-torque numbers cross at 5200 rpm? The first curve is off by a lot although the second is closer. Was the system properly set up and calibrated?

Z

Great numbers Rob!Actually its 5252rpm so the second graph is dead on. As far as the first, I heard before that if your tires skip or something while on the rollers that might throw off your hp/tq intersection point, but I'm not sure. I'd ask the shop about it anyway just to make sure and since you paid for the run.When's the next trip to Moroso?

[rsiwicki]

We were having trouble with the car downshifting into 2nd during the runs and this was the best we could get....the 2nd graph is the only clean run we got without the car downshifting.

Thanks to Wes...I now know how to disconnect the kickdown switch so this will not happen anymore and will probably get another dyno run done again soon.

I am not really interested at this point if I have 290rwhp or 275rwhp due to all the factors that can distort the true number. I think results at the 1/4 mile track should indicate that I am putting down at least 265rwhp...I was doing the dyno to see the shape of the curve and how my HP numbers are basically the same at 4,500 & 6,900 rpms. Anyone who has driven my car will tell you that the car pulls extremely hard all the way to redline without letting off. I think the only thing now hindering the performance on the car is lack of a 5/6 speed auto to get the proper gearing which is something that I will never attempt to modify.

[Q45tech]

Up to a point headers are like a longer duration exhaust cam, especially with no precats.

Considering a stock rear wheel HP of 210-220 and maybe 240-243 with JWT......... 265 would be great.

Consider that a 5.65 liter Z28 puts down 290-300 rwHP.

Can't wait for Armada/Titan dyno runs.

[elwesso]

I am not really interested at this point if I have 290rwhp or 275rwhp due to all the factors that can distort the true number. I think results at the 1/4 mile track should indicate that I am putting down at least 265rwhp...I was doing the dyno to see the shape of the curve and how my HP numbers are basically the same at 4,500 & 6,900 rpms. Anyone who has driven my car will tell you that the car pulls extremely hard all the way to redline without letting off. I think the only thing now hindering the performance on the car is lack of a 5/6 speed auto to get the proper gearing which is something that I will never attempt to modify.

Even though its notmy car I tend to agree...

I wouldnt care about the dyno numbers, i would care about roasting more BMWs and Jaguars!!

[FarFetched]

Has anyone considered swapping 5.7L LS1/2 into a Q45? Properly modded 5.7 can give you even more than 300hp at rear wheels . Friend of mine had a Chevy350 5.7 LS 1 put in his Jeep Wrangler (with other vital drivetrain modes). I am not getting into specs. He used to be a sand dragster. I remeber him saying that he got dyno measurments in a ballpark of 450hp ar wheels and ennormous amount of torque! He used to race at Moses lake sand dunes. He doesn't do it anymore, blew up that beaast, rolled it and it caught on fire! I helped him put that beast in his Jeep. I am just curious has anyone thought about such swap?

[nissanforlife]

hmnmm... not that i'm downing the credibility of the mighty 350.. its a gud engine.. . but no.. . doesn't belong in Q.. haha. . besides ... i think there would be real issues with fitment and mounting.. etc..

[Jesda]

A 350 small-block was installed in a 91 Q a few years ago. Ran 11s. Cant vouch for its reliability, but it was quick.

[QShip]

1

Up to a point headers are like a longer duration exhaust cam, especially with no precats.

Considering a stock rear wheel HP of 210-220 and maybe 240-243 with JWT......... 265 would be great.

Consider that a 5.65 liter Z28 puts down 290-300 rwHP.

Can't wait for Armada/Titan dyno runs.

1qckser will post my dyno sheet from my stock Titan.

[Rex]

... I am just curious has anyone thought about such swap?

As Jesda said, there was one, it was on ebay a few times, IIRC it had a plane in the background pictures??

Yes, aswap like that can be done (what can't with enough money??), but aside from the legal issues of that motor never being offered in that chassis and such, it would just be so much more work than necessary. Swap a seriously built SB Chevy into a mid-80's Caprice or Impala (4 door or wagon), get some widened stock looking rims and go stealth mode.

Of course if you hva eall these parts sitting around, and the ways/means to do the fabrication, go for it .

[one ton garage]

Actually... supposedly if you drop in an engine newer than your chassis, and keep all the necessary smog-related equipment, you could legalize your engine swap... regardless of what kind of engine it is (has to be a usdm one though). In all honesty, I've been really really intrigued by the last-gen mustang cobra motor... the one that came from the factory with the eaton blower on top. Even with its low compression, the motor makes crazy n/a power w/o the blower. And I personally find it kinda similar to the VH45... well, at least in the displacement and DOHC design departments. It would be interesting to try and build up a VH45 in a similar fashion to how those ford guys are building up their mod motors

[Jesda]

I think it depends on state regulations.

[elwesso]

With Indiana, you can make it legal if you consider your car a kit car...

Thats how you import skylines here without the fuss.. Import them in pieces (say engine/transmission then the body) and then it becomes a kit car...

[Jeff Williams]

Here is my first run, with the OEM Exhaust (pup cats gutted), STILLEN POP Charger, and NICO ECU.

We had trouble keeping the car in third. It wanted to downshift into second at anything under about 4,000 RPM.

I checked the Intake temperature, and it was about 101 Degrees F. The room temp & humidity are listed.

The DYNOJET is using the SAE correction factor, with a smoothing of 5. Without it, the numbers were 10% higher.

Not quite what Rob's Q was running with his set-up, but I am happy.

The funny curly Q's are where the torque converter was locking up, I think. That was when he was going from a steady acceleration, to WOT.

The air fuel ratios are way too lean, for my taste.

The second run, was with the car in second gear.

I let the car idle for 15 minutes before the first pull. We let it cool down, before the last run, which had the best numbers

Interesting notes:

1. My tach is off about 400 RPM. When the rev limiter hit, the tach read 7600 RPM.

2. My speedo is off about 4 MPH at 151. It was reading 155 MPH.

3. 151 MPH is the limit in 3rd gear, with my 275/35/18's.



I will do another pull, next Tuesday, with the new exhaust on the car.

[Q45tech]

Try to get a Consult to data log the ignition advance vs rpm during the dyno pulls..................easy to see if KS are pulling out timing if 28 degrees is not accomplished at 6,000 rpm. OR find some 100+ octane racing fuel and add 2 gallons to 8 gallons of the 93 octane pump to reduce KS activity.

110F air filter ambient creates 50F/11F =4.5% lower than SAE STD power [60F] that is at least 12 RWHP.

With a 0.787 correction factor 310=244 RWHP...............I would expect 250-260 Rear lb/ft. Some times spark knock is highest at the torque peak rpm and just 3 degrees retard from 22-24 say 19-21 would result in the power drop shown.

[RobertsnewQ]

That seems awfully lean - I've never seen anything leaner than 13.0 at full throttle (and the ECU is tuned for that).

Is that measure taken out the tailpipe or before the cats (single cat, in your case)?

If it's out the tail with a probe, it's almost 1 point too lean in most cases - unless it's corrected.

[Jeff Williams]

Try to get a Consult to data log the ignition advance vs rpm during the dyno pulls..................easy to see if KS are pulling out timing if 28 degrees is not accomplished at 6,000 rpm. OR find some 100+ octane racing fuel and add 2 gallons to 8 gallons of the 93 octane pump to reduce KS activity.

110F air filter ambient creates 50F/11F =4.5% lower than SAE STD power [60F] that is at least 12 RWHP.

With a 0.787 correction factor 310=244 RWHP...............I would expect 250-260 Rear lb/ft. Some times spark knock is highest at the torque peak rpm and just 3 degrees retard from 22-24 say 19-21 would result in the power drop shown.

I found out the tech at Brewbaker is a god friend of the guys at Pro Performance. Maybe they could "borrow" the Consult for my next run. I posted the Consult results in another thread, Dennis. I don't think they are exactly what I need, but it might be a help. If you can tell me exactly what I need them to print, I can get them to do another run at the dealership when I go back for the last belt change (they were short one yesterday).

Thanks a bunch!