ALH turbo lag

janjis313 · Jul 21, 2020

Hello everyone,
I have installed an SDI cam and 100hp injectors on my ALH and now it has a massive turbo lag just like it would have limp mode before it reaches 2250 rpms after that it just pulls. Can anybody point me to the right direction where to resolve this issue?

Mongler98 · Jul 21, 2020

Fuel lag more than turbo spool time
Turbo lag is the lag time ot takes to regain boost between shifts. Spool lag is the lag it takes from idle to full boost in 1st or 2nd gear.
Get a tune.
Did you DIY the nozzles or just swap the full injector/nozzle ?
Cam is worthless with out increasing boost and in your case, probably hurts performance. Cam is usually only beneficial when you get a full or mild port job with larger springs and run much higher rpms.

[486] · Jul 21, 2020

janjis313 said:
Hello everyone,
I have installed an SDI cam and 100hp injectors on my ALH and now it has a massive turbo lag just like it would have limp mode before it reaches 2250 rpms after that it just pulls. Can anybody point me to the right direction where to resolve this issue?

retarded camshaft timing will do this, I had mine a few flywheel teeth off and it would barely get out of its own way
are you certain you got the timing correct?

janjis313 · Jul 24, 2020

Mongler98 said:
Fuel lag more than turbo spool time
Turbo lag is the lag time ot takes to regain boost between shifts. Spool lag is the lag it takes from idle to full boost in 1st or 2nd gear.
Get a tune.
Did you DIY the nozzles or just swap the full injector/nozzle ?
Cam is worthless with out increasing boost and in your case, probably hurts performance. Cam is usually only beneficial when you get a full or mild port job with larger springs and run much higher rpms.

Thanks for the explanation.

I did a full injector swap and I'm panning to add a PD150 intake and a tune also I'm planning to run the turbo at 1.1 bars

[486] said:
retarded camshaft timing will do this, I had mine a few flywheel teeth off and it would barely get out of its own way
are you certain you got the timing correct?

The only timing we did change is on the fuel pump, we maxed it out by turning it to the firewall direction

[486] · Jul 24, 2020

janjis313 said:
The only timing we did change is on the fuel pump, we maxed it out by turning it to the firewall direction

from underneath?

looking at the front of the engine, it turns clockwise, so if you're wrenching from the top, you'd be turning the wrench on the pump's 22mm nut toward the core support

Yourbuddysatin · Jul 24, 2020

Like 486 is saying above to advance the pump must turn to the front of the car. Sounds like you retarded the timing.

Mongler98 · Jul 24, 2020

Why swap IPs? Plenty of power can be made with the stock one. Pd150/130 is a great bolt on upgrade for low to mid tier builds.
Just get some good nozzles and run whatever you feel you need for a stage 2 tune. No reason to swap ips.

Rrusse11 · Jul 24, 2020

"The only timing we did change is on the fuel pump, we maxed it out by turning it to the firewall direction"

Yep, turned the pump the wrong way. No VCDS? No way of knowing where you are on timing
without checking it electronically, or at least checking the crank mark.

ALH turbo lag

janjis313

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Mongler98

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[486]

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janjis313

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[486]

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Yourbuddysatin

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