Jerod's Supercharged T[u]RD Build

[Speedy]

The boost "seems" stable based on the gauge reading but I guess anything is possible.

You're right, COT is not a direct measurement, it's inferred from the exhaust sensors and some other stuff like MAF, injector pw, etc I suspect. My Hellcat doesn't have EGT sensors but it definitely does COT and I can see in the tune how much fuel it adds at the pre-determined estimated exhaust temp and it's A LOT lol.

I don't think the meth will control it as I suspect there are more sensors in play than just the exhaust narrow (or wide) band, but that's just a theory on this 4Runner.

 

[gamefreakgc]

The boost "seems" stable based on the gauge reading but I guess anything is possible.

You're right, COT is not a direct measurement, it's inferred from the exhaust sensors and some other stuff like MAF, injector pw, etc I suspect. My Hellcat doesn't have EGT sensors but it definitely does COT and I can see in the tune how much fuel it adds at the pre-determined estimated exhaust temp and it's A LOT lol.

I don't think the meth will control it as I suspect there are more sensors in play than just the exhaust narrow (or wide) band, but that's just a theory on this 4Runner.

Belt slippage could be minor enough that the gauge doesn't move quick enough (especially if it's analog). I think only a data log could see it. My data log is sensitive enough that it captures the supercharger surges, the boost constantly oscillates between 9.5 to 10 PSI in 2nd gear. I only see 11 PSI in 3rd.

 

[phattyduck]

I'd be really surprised if there is anything like a COT protection in the ECU - it was such an 'understressed' application in the beginning, why would they implement that feature?

JDM 3s-gte's do have EGT sensors - but it doesn't even connect to the ECU... It only lights a warning on the gauge cluster. So I suppose it is possible Toyota was thinking about that kind of stuff. That's slightly older tech though (pre-OBDII).

-Charlie

 

[Speedy]

My boost gauge is digital and tied to the water/meth controller. I see a constant 9psi on the gauge in hot weather and almost 11 in cold.

If it's not COT it's definitely something. I can make 3-4 good pulls and AFR will be great....like 11.8 - 12.3, then another pull it'll quickly drop to 10.9 and stay there.

 

[gamefreakgc]

My boost gauge is digital and tied to the water/meth controller. I see a constant 9psi on the gauge in hot weather and almost 11 in cold.

If it's not COT it's definitely something. I can make 3-4 good pulls and AFR will be great....like 11.8 - 12.3, then another pull it'll quickly drop to 10.9 and stay there.

Yeah that's a head-scratcher for sure. It's not like the ECU learns any sort of fuel trims or anything like that at WOT either. Hopefully you can iron out the kinks, I can't think of anything else that might randomly dump fuel after a few runs.

 

[Speedy]

I don't think there are any kinks to iron out honestly. The same occured stock (I monitored with the wideband before ever installing the blower), occurred before the meth injection, and after.

Mine's a 2002 and I "think" the first year they went to a wideband front O2 sensor. That may be a clue to why this truck goes it to COT. I'd expect it to be a common deal as cats are expensive and manufacturers wouldn't want them burning up with any regularity. Every car I've had the ability to tune had COT tables.

 

[gamefreakgc]

Had some time to smooth out my AFR's. Did a few runs today and found that 12.1 - 12.2 AFR sits reaaal nice. Here's the final result.

Blue is new smooth AFR with aFe filter
Red is leaner AFR with aFe filter
Orange is stock filter with old tune

In total, the change from going from 11.3-11.5 AFR's (my AEM was reading the AFR innacurately by 0.3) to 12.1 - 12.2 and changing the air filter to the aFe Pro 5S has netted a gain of 11 RWHP. But that's only part of the story, since peak torque has improved by 31 RWTQ! I can really feel the engine pull in the 4000-5000 RPM range!

HP Increase:

+12 HP

Running Total:

+121 HP

P.S. on a side note, I tried altering the MAF signal to trick the ECU into showing more timing. Yeah, that didn't work, ran like absolute garbage!

 

[Speedy]

What software is providing the graph data?

 

[T4Rchadly]

looks bad to the bone

 

[gamefreakgc]

What software is providing the graph data?

Virtual Dyno, it takes data logs in .txt, .xls, and other formats and calculates TQ and HP based on RPM, speed, elapsed time and anything else in the log.
The AEM FIC 6 creates .txt logs. I took an actual dyno run and fiddled with the weight until it matched the power output measured on the the dyno so these numbers should actually be in the ballpark.

I can "feel" a difference but it's hard to tell how much of a difference it makes. This program confirms the difference and puts an actual number on it.

 

[Speedy]

That's cool! I love that kinda stuff. I data log the Hellcat a lot (been dialing in the tune). I've got Torque and a OBDII reader, wonder if it would provide the data that program requires.

EDIT

Dang! I just went and looked up Virtual Dyno. I actually have an OLD version of that program from 2009. It used to be called TTDyno I think.

 

[gamefreakgc]

That's cool! I love that kinda stuff. I data log the Hellcat a lot (been dialing in the tune). I've got Torque and a OBDII reader, wonder if it would provide the data that program requires.

EDIT

Dang! I just went and looked up Virtual Dyno. I actually have an OLD version of that program from 2009. It used to be called TTDyno I think.

I know Torque does have a data logging feature but I can't get it to work right, I cannot export the files from my phone. Was going to overlay timing advance and open/closed loop status on my AEM data for a more complete picture but wasn't worth the hassle.

 

[gamefreakgc]

Got a replacement throttle body so I can keep driving my 4Runner while I get my throttle body bored at Maxbore.com throttle body boring service and repair. He said he's about 7 days out so I'm thinking it'll be close to 2 weeks or so when it's all said and done.

He will bore out the inside wall of the throttle body from 60mm to 63.5mm (12% more air flow) as well as a low profile throttle valve. I'm going to take a guess and say it will add about 5-10 HP to my engine.

 

[gamefreakgc]

Took some time when swapping throttle bodies to measure the sizes of my existing intake piping. Here's what I learned:

The supercharger itself measures between 62-62.5mm depending on where you measure (it's not completely round because of the bend). I was actually surprised to see it's bigger than the throttle body, which confirms my theory there's power to be gained with a larger throttle body. Not only is the stock TB 60mm, but it's also got a thick valve which restricts flow.

The maxbore TB will be 63.5mm which is just about perfect. Having it slightly larger than the supercharger it not a bad thing, since you want a slightly larger bore to equate for the valve itself and the flow it restricts.

The one problem I did encounter is the Airaid intake tube. It's only 60mm:

Thankfully it's plastic so gonna borrow a dremel and bore it out by hand as best I can. Want to get it at least to 63mm. We'll see how that goes.

 

[gamefreakgc]

The Turd has a brother in the backyard as of today. 98 Limited, AKA "Party McPart Face". This is my 3rd gen #5 for me...

 

[gamefreakgc]

I had my throttle body shipped off to Maxbore.com to be bored out slightly, have the shaft machined down and matched the intake of the supercharger. It turned out pretty good:

Stock size:

You can notice the thinner shaft. Here's the two side by side, notice the thickness of the IAC passageways on the bottom and the difference between the two:

Some measurement comparisons between the two:

Front

Stock - 66mm
Maxbore - 66.4mm

Middle (as close to the throttle valve as I could get:

Stock - 60.4mm
Maxbore - 61.9mm

Rear

Stock - 60.4mm
Maxbore - 63mm

I took it out for a few runs and overlayed it from a dyno from earlier in the year and noticed that it said I had lost 25 RWTQ! Confused, I remember that it was a day that had low humidity and in the 50's, and today was higher humidity and in the upper 80's! That's where my power went. So, no chart this time around, I didn't take a run before swapping the throttle bodies, which next time I will before a mod. Gonna take a guess on this one.

HP Increase:

+5 HP

Running Total:

+126 HP

I really, really need a new exhaust though. My power dies at 5000 RPM.

 

[gamefreakgc]

So no dyno charts, but I do have fuel trim data.

Pre-intake bore or throttle body bore, my long-term trims while under light to moderate throttle would hover around -6.4% to -8.0%. All that means is that it was pulling a small amount of fuel because of my oversized injectors. Now with the larger throttle body and larger intake to match, the are hovering from -4.8% to -6.4%, so they've richened up a little. And that's just at partial throttle. A higher fuel trim means there's more fuel being added to compensate with the extra airflow. I saw the same sort of jump, although higher, when I had the headers installed.

I can feel a slight difference driving it around town, but that's partially due to the junkyard unit I had in was bit dirty and gunked up and it's great having the ol' reliable one back on. Also, I noticed the new butterfly valve is air tight in the housing (very very well made) and has smoothed out the idle.

Can't wait for cooler weather to get this thing tested out for real.

 

[gamefreakgc]

If you guys follow my build thread enough, you'll find that I am willing to throw any sort of cleaner, fuel additive (I'm injecting water LOL) or oil in my 4Runner. Some I've had success with, such as Seafoam, others have been a bust. I tried a new product yesterday, Royal Purple's Max Atomizer fuel injector cleaner. I've tried other cleaners in the past, Techron, Lucas, and didn't notice a difference at all. Since I'm now a big fan of Royal Purple's Max ATF fluid (greatly improved shift smoothness with modified valve body) and their performance oil line, figured I'd give it a try.

It's a fairly small bottle at 6 oz, and contains a large amount of polyether amine (PEA at 85%) which is used in the more expensive fuel injector treatments you can have done at a dealer or private shop. I figured for $6.99, it's worth a go. My idle hasn't been all that great lately, it's got a bit of a misfire when it idles under 700 RPM that wasn't there when I put the engine in.

With only 20 miles since adding the the idle is buttery smooth again! Honestly, I was not expecting that at all. It feels like I did when I first put the engine in back in January! I'm not sure if I had something lodged in an injector or it was just deposits affecting the operation of the injectors or what, but this was well worth the $6.99 I bought it for! Looking forward to running through the rest of the tank and see if things improve more.

 

[gamefreakgc]

If you guys follow my build thread enough, you'll find that I am willing to throw any sort of cleaner, fuel additive (I'm injecting water LOL) or oil in my 4Runner. Some I've had success with, such as Seafoam, others have been a bust. I tried a new product yesterday, Royal Purple's Max Atomizer fuel injector cleaner. I've tried other cleaners in the past, Techron, Lucas, and didn't notice a difference at all. Since I'm now a big fan of Royal Purple's Max ATF fluid (greatly improved shift smoothness with modified valve body) and their performance oil line, figured I'd give it a try.

It's a fairly small bottle at 6 oz, and contains a large amount of polyether amine (PEA at 85%) which is used in the more expensive fuel injector treatments you can have done at a dealer or private shop. I figured for $6.99, it's worth a go. My idle hasn't been all that great lately, it's got a bit of a misfire when it idles under 700 RPM that wasn't there when I put the engine in.

With only 20 miles since adding the the idle is buttery smooth again! Honestly, I was not expecting that at all. It feels like I did when I first put the engine in back in January! I'm not sure if I had something lodged in an injector or it was just deposits affecting the operation of the injectors or what, but this was well worth the $6.99 I bought it for! Looking forward to running through the rest of the tank and see if things improve more.

Follow up on the Royal Purple's Max Atomizer fuel injector cleaner. After the first tank it ran amazing. By about tank 4, so roughly 1200 miles after adding the cleaner, the misfire at idle returned. I put another bottle in so let's see if using it more frequently cleans better. Idle is smooth again after adding the product.

 

[gamefreakgc]

Went camping with the wife and kids on the Oregon coast. First time out on the sand! Found out my H/T rated tires kinda suck in loose sand, didn't get stuck though at least. Was good times with the family.

I should also mention that my 4Runner loved the 92 Octane fuel in Oregon. I'm going to goof around with some Boostane and running some 94/95 equivalent fuel.