s5 motor ported by judge ito
goopy apex seals
denso fuel pump, 720,1680cc injectors 93 octane
11.5 ngk race plugs, stock fc coils and hks twin strike
td61 w/ billet wheel, twin scroll, 1.00 rear AR by BNRSUPERCARS
3"dp to 2 1/4 y pipe
50/50 devils own AI by weight
tune and dyno by BDC and ART in sarasota

tuned at 18 psi



just got upgrade aem smart coils and will get getting a aeromotive 340 pump from turblown.
planning on running 22 psi.
possibly a 3.5 dp as well.

 

Nice!

 

i don't understand why your torque peaks at 5300. given the porting, i did look at your photobucket link, i would expect peak Tq to be at 6400+.

howard

 

think something is choking it howard? or maybe timing?

 

i think it is a significant question.

it probably isn't timing.

peak torque is the point of max airflow into a motor. torque declines thereafter as RPM increases providing less time to receive airflow. this is why generally fuel is reduced after peak torque as it isn't needed because of less air flow.

i looked at your ports and i am familiar, in my case unfortunately, w Juan's ports. they should be flowing more.

perhaps you have an unusual restriction in your manifolding, air filter, exhaust?

howard

 

it has a hks twin scroll manifold, twin scroll t4.
3"downpipe to a ssautochrome y pipe.

maybe dp too small? i noticed i hit full boost alil late too, maybe 5.500 rpms? on a 1.00 ar housing

 

i purposely run a 3 inch exhaust (RB catback & Borla 40944 straight thru mid muffler) and don't have any mid-range spool problems.

hc

 

hmmm, could a boost leak effect torque numbers?

 

put a smoke machine on my car and the o ring for the bov is leaking.

 

 

a comparison of your power distribution against 62 dyno charts does confirm the obvious...

your power is distributed more to the early rpm plots and lags between 5500 on up the scale.

the X datapoints, 1 thru 6, start at 5000 and are in 500 rpm increments. the Y scale is % of total output between 5000 and 7500.



i don't have your dyno sheet up but i recall you are close to 10.0 AFR around 6000 and were in the 11s earlier.

my conclusion is your peak torque location was caused by too rich AFRs.

it is good you found a leak. my bet is 50% of our single turbos will not perfectly pass the smoke test. i don't think the leak caused the torque to relocate although it probably cost a modest amount of hp loss.

you will, of course, make a bunch more power around 11.4 or so...

howard

 

so basically my afr are too rich? never thought that would affect my torque.
my dyno graph is on first post. do u think im too rich all around or just 5k rpms and later?

btw i wanna thank you for taking the time for helping, greatly appreciated!

 

"afr are too rich? never thought that would affect my torque."

some questions are hard to answer. this one is not.

yes. there's a bunch of torque/hp to be had. you should be ideally running somewhere in the 11.3 area. looking at the AFR line the under-performance directly correlates to your trip into the sub 10.5 area.

howard

 

FWIW, here's my 62mm turbo dyno (@11.5psi), and a graph with hp/tq from the 340hp run:
this is a divided T4 Turblown manifold with divided .84 T4 turbine housing. dual 38mm MV-S wastegates recirculated into the downpipe.

 

i bet ur boost is really fast with that setup jacob.
ur dyno plot kinda looks like mine

 

here's a an additional power dist plot... i am adding Jacob's 11.5 psi 62 mm figures. the average for my 62 dyno data is Series 1. Jacob is Series 3 and the OP is Series 2. neither of the dyno runs states the method of correction and i do not use data that does not disclose the CF... (all are corrected to SAE)

nevertheless the picture is clear...

whether the boost is large or small the distribution for any type of non bridgeport, non peripheral port is fairly similar. when you have significant divergence, as in this case, you'd best be looking for answers.



the X line, as mentioned in an earlier post starts at 5000 rpm and rises 500 per plot ending at 7500. the Y line is % of total power from the 6 inputs.

howard

 

yup i see it, i hope its just from over fueling. i recently swapped in the aem coils and havent boosted it yet, ill keep an eye on the afrs and see. my guess is with this coils they might lean it out some.
as for timing i believe it was @ 13* with a 12* split if that makes a difference

 

my money is on the AFRs being the culprit but the coils are an upgrade.

hc

 

thank u for ur time and knowledge.
on a side note have u experience much noise with the aem coils?
got some autolite x i might thru in to see how they ride compared to the 10 ngk race plugs!

 

"much noise with the aem coils?"

the coils really put out... you need first class primary wires with tight boots. if you can, run your car in the dark/hood up/ and look for any leaking elec

howard

 

ran it in dark last night. no sparks.
the wires and boots i got from judge ito he said is a perfect match for the coils. very tight fit, almost suction like.