Vf52 experiences vs 46

[PoidaGT]

The inlet definitely improves spool rate, but not by 750rpm (more like 200rpm)
I would say a dump pipe would improve spool by 750rpm.
Headers actually increase lag between 200-400rpm.
I added a VF52, EL headers and inlet pipe and I got an extra 700rpm of lag all up.
MSR said a different dump pipe with a cat lower in the exhaust would improve my spool rate by 200rpm.

[peadya100]

The inlet definitely improves spool rate, but not by 750rpm (more like 200rpm)
I would say a dump pipe would improve spool by 750rpm.
Headers actually increase lag between 200-400rpm.
I added a VF52, EL headers and inlet pipe and I got an extra 700rpm of lag all up.
MSR said a different dump pipe with a cat lower in the exhaust would improve my spool rate by 200rpm.

You might be right peter, it was a while ago that MSR told me that.
Unless someone mods their car 1 item at a time its really impossible to accurately figure out spool time changes. My spool time improved, but I had a TBE and tune done with the inlet.
You should get mick to look into your lag peter as bass straighteners car has the same mods as yours and is also MSR tuned and his doesnt seem to spool as late?
Im about to VF52 my car with a tune as well so Ill be able to compare with yours then as I dont have the headers or top mount.

[bass_straitener]

The inlet definitely improves spool rate, but not by 750rpm (more like 200rpm)
I would say a dump pipe would improve spool by 750rpm.
Headers actually increase lag between 200-400rpm.
I added a VF52, EL headers and inlet pipe and I got an extra 700rpm of lag all up.
MSR said a different dump pipe with a cat lower in the exhaust would improve my spool rate by 200rpm.

You might be right peter, it was a while ago that MSR told me that.
Unless someone mods their car 1 item at a time its really impossible to accurately figure out spool time changes. My spool time improved, but I had a TBE and tune done with the inlet.
You should get mick to look into your lag peter as bass straighteners car has the same mods as yours and is also MSR tuned and his doesnt seem to spool as late?
Im about to VF52 my car with a tune as well so Ill be able to compare with yours then as I dont have the headers or top mount.

Mine is a manual car so very different. I see 18.5 psi at 3140RPM. That's peak boost on my car BTW.

[Newbie GT]

The inlet definitely improves spool rate, but not by 750rpm (more like 200rpm)
I would say a dump pipe would improve spool by 750rpm.
Headers actually increase lag between 200-400rpm.
I added a VF52, EL headers and inlet pipe and I got an extra 700rpm of lag all up.
MSR said a different dump pipe with a cat lower in the exhaust would improve my spool rate by 200rpm.

You might be right peter, it was a while ago that MSR told me that.
Unless someone mods their car 1 item at a time its really impossible to accurately figure out spool time changes. My spool time improved, but I had a TBE and tune done with the inlet.
You should get mick to look into your lag peter as bass straighteners car has the same mods as yours and is also MSR tuned and his doesnt seem to spool as late?
Im about to VF52 my car with a tune as well so Ill be able to compare with yours then as I dont have the headers or top mount.

Mine is a manual car so very different. I see 18.5 psi at 3140RPM. That's peak boost on my car BTW.

Bruce do you find the 3140rpm to high to hit boost compared to say a tuned vf46 that comes on at say 2700rpm?

Drivability ?

[owen]

Bruce's car would feel better at 2500rpm than yours at 3200rpm. Just replicate Bruce's build and stop wasting people's time with the same question rephrased in 20 times

[Newbie GT]

Bruce's car would feel better at 2500rpm than yours at 3200rpm. Just replicate Bruce's build and stop wasting people's time with the same question rephrased in 20 times

Relax mate don't waste your time replying if nothing worth while saying

[bass_straitener]

Bruce do you find the 3140rpm to high to hit boost compared to say a tuned vf46 that comes on at say 2700rpm?

Drivability ?

The stock tune has peak boost set at 0.947 bar or 13.7psi. requested from 2300RPM to 3600RPM before falling away. I don't actually know if it makes 13.7psi at 2300RPM as I've don't have a log or graph handy.

The VF52 in my car hits 18.5 at 3140RPM. At 2700RPM I make 13.5psi and continues to build to 18.5psi and hold to 4750RPM before falling away to 12.5 at redline. I know which one I like more.

I don't find it affects driveability at all. I've run my car up against other Libs with tuned VF46 turbos and I've always kept up lower down and start pulling away up top. Just as you'd expect.

On paper there may be a difference but on the road as stated I've seen nothing to suggest I'm suffering from any lag related issues.

I'm sure there are bigger and better turbos, but for the street the VF52 is a great upgrade. My car is not a track car or drag car.

[PoidaGT]

You should get mick to look into your lag peter as bass straighteners car has the same mods as yours and is also MSR tuned and his doesnt seem to spool as late?

Mick says that the manuals will spool up a bit earlier than autos anyway.
Bruce has got aftermarket high flow mufflers on and mine has stock mufflers which makes a bit of a difference.
Mick also said that my dump pipe is different to Bruce's one which can make a difference to spool rate.
He said that having the Cat lower in the down pipe makes it spool earlier as well as the splitter size and location in the collector also makes a difference.
This is why Mick prefers X Force as he said their dumpipes seem to get good all round performance for a good price.

[Manaz]

Poida - I assume the benefit of the EL headers is better top end (sacrificing low-end spool and the boxer note)?

Interesting that the gearbox makes a difference on spool - I guess the auto can "hide" load from the engine by slipping before lockup.

Sounds like an XForce exhaust for me.

[bass_straitener]

Poida - I assume the benefit of the EL headers is better top end (sacrificing low-end spool and the boxer note)?

Interesting that the gearbox makes a difference on spool - I guess the auto can "hide" load from the engine by slipping before lockup.

Sounds like an XForce exhaust for me.

I have ceramic coated UEL headers as well. I like the boxer rumble and prefer the lower down torque more than anything the EL would deliver up top.

[Manaz]

I have ceramic coated UEL headers as well. I like the boxer rumble and prefer the lower down torque more than anything the EL would deliver up top.

That's the path I'll likely be taking...

[peadya100]

Poida - I assume the benefit of the EL headers is better top end (sacrificing low-end spool and the boxer note)?

Interesting that the gearbox makes a difference on spool - I guess the auto can "hide" load from the engine by slipping before lockup.

Sounds like an XForce exhaust for me.

Im surprised the gearboxes make that much difference too... oh well im upgrading the turbo regardless

In my opinion lag is only an issue for the gear youre in when you plant it. The next gear you change into will be starting above the rev range anyway. Ive been in cars with huge turbos that kick in at 4500rpm and ive never felt the lag to be an issue.

[PoidaGT]

The lag only affects me off the mark.
Once its moving you just change down until its in the sweet spot of the turbo.

Equal length headers give better top end performance but increase lag.
They make the engine noise much smoother however you lose that boxer rumble.

[KiDo_Tuning]

Patrick/agan has 17.6psi at 2300rpm with an auto in 3rd gear doing 57kph, no transmission slip generates more spool and thus a wider wheel torque power curve

[PoidaGT]

I really like the new 911 turbos with variable vane turbo technology.
They get peak torque at 2200 rpm (750nm) and it carries all the way to 7000rpm.
awesome!