75 C10 wanting to pick up some ET

[ELSimple]

Looking for some ideas to pick up some ET. This is front side prepped. I am running a 275 tire on a 17? rim.

5.3 forged mahles rings gapped at .024 (IIRC), gen 4 rods with arp bolts with stock crank. Arp main bolts. Clevite 77 bearings bottom end balanced, Vinci trucker hi-lift cam 216/224 .585 lift 115 LSA ( i dont remember the built in advance)

862 heads with 2? intake valves, 5 angle valve job, hand blending and valve de-shrouding, clean up mill only, che trunion upgrade, dual SS springs, titanium retainers, 7.4 hardened pushrods. Stocker rockers

92mm warr dbc throttle body, tbss intake, return fuel system,800cc injectors, 485lph pump, 1:1 FPR, Long tube headers, 2.5? dual exhaust with X pipe no cats, dyno max ultraflows

75mm torqstorm with gen 2 cover, 3? intercooler and piping

4l80 not built part of the hd2 kit installed, circle d flex plate, circle d 258 billet single disc 2800 stall, 3.73?s, gm 12 bolt LSD.

Have not been on the dyno. Truck ran a 13.333 last run. Have not tuned e85 in yet only running pump 91 e10.

I think I can cut down some shift time. Add a two step. Looking to break into the 12.9?s

first run was 13.444 added 2* timing ran 13.333. Belt might have been slipping. The run had the gen1 cover on the blower.

Its a bagged truck. Not a race truck. It just sees the track sometimes.
7 23 braf adj lowered idle range 25 rpm test worked good lowered braf tiny amount.hpt
7 5 25 tnt 2 added timing corrected fuel.hpl

[abc]

I don't see anything in the tune that will net you a half second increase, unless your combo. loves timing and you can keep going up without knock. Decreasing your shift time will not net you much in terms of et. It's slightly rich but with running boost and 91 octane I wouldn't run it on the lean side to look for et. Looks to me like your quickest way to more speed is a smaller pulley (more boost), better fuel and/or possibly less timing for protection. With a second gen cover on the Torque Storm I assume you should be around 11 or 12 psi with a proper size drive set up.

[ELSimple]

I don't see anything in the tune that will net you a half second increase, unless your combo. loves timing and you can keep going up without knock. Decreasing your shift time will not net you much in terms of et. It's slightly rich but with running boost and 91 octane I wouldn't run it on the lean side to look for et. Looks to me like your quickest way to more speed is a smaller pulley (more boost), better fuel and/or possibly less timing for protection. With a second gen cover on the Torque Storm I assume you should be around 11 or 12 psi with a proper size drive set up.

I recently added the gen2 cover. I have a grip tec 2.91 on now. Peak boost is like 9.6psi. Maybe I need to pull the intercooler and run a straight pipe, see how much psi drop I have. The truck shifts into 3rd around 96 and I am trapping 105. E85 is available. That got wired in not long ago. The truck has not been on a full tank of E85 yet.

[RDF1]

It looks like your speed is laying over in the top of 2nd gear and your boost doesn't seem to show any belt slip.
Do you have any traction issues?
it took about 1.5 seconds to go from 1mph to 100% TPS.

The worse part is the boost is really low for the 3-4 seconds from the time you leave. it takes 5 seconds to reach peak boost.
Your converter is holding you back a good bit. Looks like its flashing to 2400 rpms.
The centrifugal needs rpms to build boost. If you had a tire that would hold and the converter flashed 3800 it would make a huge difference.

But the datalog looks pretty good. I agree its a tad rich but your only running 91 octane and im guessing 10-10.5 compression?

[ELSimple]

It looks like your speed is laying over in the top of 2nd gear and your boost doesn't seem to show any belt slip.
Do you have any traction issues?
it took about 1.5 seconds to go from 1mph to 100% TPS.

The worse part is the boost is really low for the 3-4 seconds from the time you leave. it takes 5 seconds to reach peak boost.
Your converter is holding you back a good bit. Looks like its flashing to 2400 rpms.
The centrifugal needs rpms to build boost. If you had a tire that would hold and the converter flashed 3800 it would make a huge difference.

But the datalog looks pretty good. I agree its a tad rich but your only running 91 octane and im guessing 10-10.5 compression?

On this night I did not have any traction issues. I was trying to foot brake it. First night I had the truck at the track on full prep. Guess I was pussy footing it off the line. Tire is a lion hart 275 with a 320 tread wear rating at 26.5 psi of pressure.
I am thinking of staging, no foot braking, and waking the pedal when the bulbs light.

Yes the engine is 10-10.5 is compression. I have full flex setup. I haven?t tuned e85 yet.

As far as the mph goes. I trap 105 and the 2-3 shifts occurs at 96mph. When you say it is laying over, do you mean it?s falling off and I should shift sooner into 3rd?

[RDF1]

Ah ok.
Got your time slip?
I imagine your 60' and 330' times are what is holding you back.

Your converter is too tight for off idle hit. So thats not going to help.

Look at your MPH in the top of 2nd on the Chart vs Time and you can see the line start flattening out before you get to 6600rpms.
Try to shift 2-3 about 200-300rpms sooner and see what happens.
Unfortunately your prolly not going to be able to do anything about the last 9mph.
Engine is laying over so you cant shift it any higher and shifting sooner is going to lower the boost.

Go to a smaller pulley to get about another 4-5psi and give it another try.

[Alvin]

You could likely lean into the timing and fuel for a little more.

Ragged edge for blower stuff is commanded eq 0.82-0.83 or 1.22 eq/lambda

Some FI builds will get into the low 20's on timing. If it can take it.

Approach these numbers with caution.

[ELSimple]

Ah ok.
Got your time slip?
I imagine your 60' and 330' times are what is holding you back.

Your converter is too tight for off idle hit. So thats not going to help.

Look at your MPH in the top of 2nd on the Chart vs Time and you can see the line start flattening out before you get to 6600rpms.
Try to shift 2-3 about 200-300rpms sooner and see what happens.
Unfortunately your prolly not going to be able to do anything about the last 9mph.
Engine is laying over so you cant shift it any higher and shifting sooner is going to lower the boost.

Go to a smaller pulley to get about another 4-5psi and give it another try.

I do have the time slips. When I get home I can send a picture of them.
Nice thing about grip Tec, the pulleys are super easy to change. Crappy thing about a Torqstorm, I have to drain the coolant to change the belt.

My innovate eco-1 shows peaks of 9.6 and the log shows peaks less than that usually. Upper 8?s. Wonder if I need to speed up the pids.

I can see what my intercooler is doing restriction wise if any.

[RDF1]

I do have the time slips. When I get home I can send a picture of them.
Nice thing about grip Tec, the pulleys are super easy to change. Crappy thing about a Torqstorm, I have to drain the coolant to change the belt.

My innovate eco-1 shows peaks of 9.6 and the log shows peaks less than that usually. Upper 8?s. Wonder if I need to speed up the pids.

I can see what my intercooler is doing restriction wise if any.

Thats 2 different sensors. Would need to have them connected to a pressure source to see if the calibration is the same.

This is why centrifugals aren't my favorite. Your not making much boost till higher rpms and it takes you awhile to get to those Rpms.

Step down a couple sizes in pulley and see how it does.

[ELSimple]

You could likely lean into the timing and fuel for a little more.

Ragged edge for blower stuff is commanded eq 0.82-0.83 or 1.22 eq/lambda

Some FI builds will get into the low 20's on timing. If it can take it.

Approach these numbers with caution.

For me being on the street tuning, I might have reached my timing cap for the big end. I feel there?s some left on the table down on the bottom and the midrange. At the 5252 crossover I?m down to mid 17?s.
Fueling at 1.24 lambda under heavy boost will likely be as lean as i go on pump. Another guy with a 6.0 and torqstorm mentioned his truck likes 12.1:1 afr.
My eq/lambda numbers are based off 14.68 even though I?m stuck with e10 91.
Et costs money.

[abc]

What rpm is the blower turning at 6000 rpm? It does seem to be building boost slowly and IAT is not rising very quick which makes me think either the blower is not spinning near it's max or your on the right track and the IC is too restrictive.

On the other hand, it appears to be safe right now, and yes, lowering ET does correspond to a rising rate, slide scale of cash.

[ELSimple]

Ah ok.
Got your time slip?
I imagine your 60' and 330' times are what is holding you back.

Your converter is too tight for off idle hit. So thats not going to help.

Look at your MPH in the top of 2nd on the Chart vs Time and you can see the line start flattening out before you get to 6600rpms.
Try to shift 2-3 about 200-300rpms sooner and see what happens.
Unfortunately your prolly not going to be able to do anything about the last 9mph.
Engine is laying over so you cant shift it any higher and shifting sooner is going to lower the boost.

Go to a smaller pulley to get about another 4-5psi and give it another try.

I thought I could add a pic from my phone but?
First run
Rt .344
60? 2.161
330? 5.902
1/8 8.829 @ 85.23 mph
1000? 11.327
1/4 13.444 @ 105.17 mph

Second run
Rt .355
60? 2.198
330? 5.882
1/8 8.772 @86.29
1000 11.237
1/4 13.333 @ 106.19

[RDF1]

For me being on the street tuning, I might have reached my timing cap for the big end. I feel there?s some left on the table down on the bottom and the midrange. At the 5252 crossover I?m down to mid 17?s.
Fueling at 1.24 lambda under heavy boost will likely be as lean as i go on pump. Another guy with a 6.0 and torqstorm mentioned his truck likes 12.1:1 afr.
My eq/lambda numbers are based off 14.68 even though I?m stuck with e10 91.
Et costs money.

Best thing to do is to pull plugs and see what they tell you. You running TR6 or BR7EF plugs?

I thought I could add a pic from my phone but?
First run
Rt .344
60? 2.161
330? 5.902
1/8 8.829 @ 85.23 mph
1000? 11.327
1/4 13.444 @ 105.17 mph

Second run
Rt .355
60? 2.198
330? 5.882
1/8 8.772 @86.29
1000 11.237
1/4 13.333 @ 106.19

Thats fine.
Wanted to just look at the numbers.
If you could make that 8psi when you let off the brake pedal it would make a world of difference.


Converter and pulley change you could get in the mid 12s easy.

[ELSimple]

Best thing to do is to pull plugs and see what they tell you. You running TR6 or BR7EF plugs?




Thats fine.
Wanted to just look at the numbers.
If you could make that 8psi when you let off the brake pedal it would make a world of difference.


Converter and pulley change you could get in the mid 12s easy.

I have tr6?s installed. I have extras of both on the shelf. Do I have to plug chop them or can I pull one and read it?

[bk2life]

2.1 60 is your issues

[RDF1]

I have tr6?s installed. I have extras of both on the shelf. Do I have to plug chop them or can I pull one and read it?

Just put a new one in and make a pass. Then pull it to see if it shows anything.

[ELSimple]

2.1 60 is your issues

That is a big part of it.

what part of Az are you in? I am in tucson.

[ELSimple]

Ah ok.
Got your time slip?
I imagine your 60' and 330' times are what is holding you back.

Your converter is too tight for off idle hit. So thats not going to help.

Look at your MPH in the top of 2nd on the Chart vs Time and you can see the line start flattening out before you get to 6600rpms.
Try to shift 2-3 about 200-300rpms sooner and see what happens.
Unfortunately your prolly not going to be able to do anything about the last 9mph.
Engine is laying over so you cant shift it any higher and shifting sooner is going to lower the boost.

Go to a smaller pulley to get about another 4-5psi and give it another try.

I looked at the log. If the transmission file has 96 mph the max speed for 100% throttle, would it hold the mph regardless of the engine rpm shift point? Is it actually falling off or am is the pcm saying you have reached max mph for 100 tps?

[bk2life]

what part of Az are you in? I am in tucson.

North Phoenix.
A bunch of us will be there in OCT (Oct 10-11 at Tucson Dragway) for a big 'no prep' race..since you live there you should come out.

[horsepowerguru427]

I looked at the log. If the transmission file has 96 mph the max speed for 100% throttle, would it hold the mph regardless of the engine rpm shift point? Is it actually falling off or am is the pcm saying you have reached max mph for 100 tps?

For shifting it wants to see the MPH reach its goal first (96 in this case), then it references RPM shift point. If the speed setting is higher than it should be and you hit RPM shift point first, it acts like youre getting a fuel cutoff or governor effect and you have to let off for it to shift.