^glad this thread is helping ppl out!

If anyone has any timing maps for single turbo setups @ near 15psi please feel free to share.

Looking at my dyno #'s, do you guys think the power drop off is normal or too much?

 

Hi,

for myself, I would like to point to a previous point of someone claiming you might have a restriction somewhere. The drop in torque is to early in my little opinion. You say, you have a big exhaust, however, do you have a silencer or some kind in between which might reduce the diameter of your exhaust or maybe to the way to your I/C?

When pulling, are your boost gauge starting to "shiver" at high RPM?

 

My exhaust is free flow. 3.5inch dp to a 3inch resonated mp and then 3inch carback with no silencers. I also have no reducers of any sort for my I/C.

Actually my boost gauge does shiver at boost. I always thought it was from my boost gauge.

 

Sorry dude, as I do not know your setup and your car, however, if your boost gauge do not "shiver" before your torque falls down, but "shiver" afterwards, YOU HAVE A RESTRICTION somewhere.

Not like to take your words in question, is just what I would like to consider given the informations provided.

 

I will investigate the issue. I believe that it shivers as soon as it reaches full boost, and that it did it before i went single but none the less I will double check

 

depends on the boost gauge, some have less buffering than others and most plumb it in right at the UIM to LIM split nipples which gives a spikey signal. teeing it into the MAP sensor line will actually smooth it out a bit.

 

Here's a pretty conservative timing map. Split is 15* in boost everywhere.

 

^Thanks for sharing!
which psi are you set at and what axis is it?

It does seem pretty conservative, and from what ive been learning, after you reach peak torque should the timing start to ramp up? yours is pretty constant all across.

 

Lets back up a little bit;

You were on the stock twins and made more HP, @ less boost( same tuner/dyno/dyno settings) ? corrected or uncorrected?

What all was changed since that stock twin dyno? I mean EVERYTHING

Instead of getting too caught up on dyno numbers, can we see the difference in fuel consumption between the setups( just post the raw inj maps), and the AFR, ignition data logs, and ambient air temps.

 

the dyno #'s are corrected. The #'s, which were all consistant came from 2 different dyno jets.

Stock twin setup: stock primaries, 1300cc secondaries, walbro 255lph, 3inch exhaust no cat, 13psi, Vmount, hks twin power, 330whp. 10.8AFR

Single setup: TD61 1.0A/R, 3.5inch Dp, stock primaries, 1680cc secondaries,3inch midpipe, catback no cat. walbro 400lph, hks twinpower, Vmount, ~14psi 320whp. 11.4AFR

Only difference is injector, fuel pump turbo, DP and tune. When I made 330whp with the stock twins it was the same tuner that made 325whp with the single. After I re-tuned it it made 320whp as the timing was set at 10 at the upper rpm's. BTW the injector duty is near 78% now with the single. I will post the fuel map along wtih the timing maps as soon as I get a datalog from my friend.

 

You duty cycle indicates fuel flow worth of 500 HP Do you have steady fuel pressure?

 

My pump is NOT re-wired but I hold steady fuel pressure.

 

I attched my corrected raw fuel map. I havnt checked my inj duty now after a few adjustments but I believe its below 75%.

BTW: timing now @ 15psi is 12 at max torque (6.2K RPM) , ramping up to 17 by redline. still too conservative? I will try to push it up to 15 when I have the car on a dyno again just to be sure that its gaining power...and so I can monitor knock.

 

Hmmmm.... You can actually see it nose dive in the map too...

 

Forgot to mention that p18 corresponds to 15psi.

yea the fuel map also shows a serious nose dive in power. solid 11.2 afr btw. Im out of ideas.

 

Boost leak... Is it a stock motor?

thewird

 

you mean the lower figures after 6500? that's pretty typical with the PFC mapping, the drops are a little extreme though like cell P16/N20 near redline but may be corrected in the injector correction map(not ideal). the whole map does look a little sloppy with a few lean spots.

 

no more boost leaks (that I know of) I can always slap on the pressure tester again and double check.

it is the stock orignal motor. so stock ports. w/50K miles 90psi even compression on a hot motor with throttle plates CLOSED. So im assuming compression is not a factor.

 

Smooth out your p-rows.
n10 n11 n12 n13 n14
You have jumps that are off Like p17- 14.36 15.57 15.33 15.27 16.00

That should be an even flow. like 14.36 14.80 15.33 15.69 16.00

Take your map and put it in a Microsoft excel, turn it into a line graph, if you do this the the "ruffness" will be very easy to see. Make it smooth. DOES THIS MAKE SENSE. YOU NEED TO SMOOTH YOUR FUEL MAP. Your injection is all over the place.

 

Here is an exampe of what I am saying. Pic 1.Take the Injection map copy paste it to excel( be sure you have base x inj in the lower right hand corner). Pic 2Then go to insert in excel and turn the data into line graph. Pic. 3 Its then easy to see how smooth your fuel millseconds are. The one I posted is some what smooth. This is a very helpful way to smooth ou your fuel map.

Keep at it man you will get it figured out.

 

Ill def use your method next time i get the car on the dyno with a datalog. Thnx for the help!

It still leaves me wondering why im not making hp and dropping off so much in the upper bands. However. I seriously want to go check of someone shoved a potato in my exhaust.

 

I can't remember if it was mentioned in this thread but is there something in your intake, pipes, or the intercooler?

 

nothing abnormal. I dont have any restrictions as far as intake/i/c goes.

 

This thread has it all. Tuning, Maintenance, Troubleshooting, Naked women... Well working on the latter. Good Stuff fellas I'm stuck on this like a single mother reading a romance novella.

 

A stock engine will drop off like that on the fuel maps. It will mimic your torque curve.

thewird