[JasonD]

Mods include regular roto fab, 103 throttle body, Kong x-port, 2.3” upper pulley, 1 7/8” headers. Made 644/614 at the wheel. Boost went from 8psi at 2.5k rpm to 14.7 at 6.5k rpm. Is this a function of the x-port work? I thought these blowers typically produce a flat boost curve? I have no baseline pull. A stock, manual zl1 produced 540whp on this dyno, I’m told. My car is an auto.

[D3adch1ld]

How much timing? I have similar mods with the addition of full E85. We managed 26.5* of timing. No dyno numbers tho, but the car is a brute.

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[EDFHOBBIES]

is that with stock pulley or a 2.3 or lower

[JasonD]

Originally Posted by D3adch1ld

How much timing? I have similar mods with the addition of full E85. We managed 26.5* of timing. No dyno numbers tho, but the car is a brute.

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I forgot to ask about the timing. This was on 93 octane. Running e85 would be killer. What did you have to do to be able to run it?

[JasonD]

Originally Posted by EDFHOBBIES

is that with stock pulley or a 2.3 or lower

2.3 upper, stock lower.

[D3adch1ld]

Originally Posted by JasonD

I forgot to ask about the timing. This was on 93 octane. Running e85 would be killer. What did you have to do to be able to run it?

I started with 1-7/8 catless headers, 95 mm tb, and Rotofab cai, but the car would pull 3-4 degrees at anything warmer than 70° ambient on 93 at about 17°, so I upted to do the DSX Aux and FlexFuel... managed to run e55 on a stock blower, no pulley, maxed at 21.5°. Got fed up of calculating E85 and looked for a deal on a XDI second HPFP and the ported blower with 2.3 pulley. Retuned and landed some E82 (in the summer months in NY), managed 26.5°, cant recall the total boost, but total gain was about 2psi in comparisson to stock blower... all with an untouched long block.

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[Z OH 6]

Couple things I see wrong with this build. The 2.3 upper pulley isn't spinning the blower fast enough to take advantage of the Kong X-port. Also the 1 7/8" header are giving up some power.

[Camaro1973]

Originally Posted by JasonD

Mods include regular roto fab, 103 throttle body, Kong x-port, 2.3” upper pulley, 1 7/8” headers. Made 644/614 at the wheel. Boost went from 8psi at 2.5k rpm to 14.7 at 6.5k rpm. Is this a function of the x-port work? I thought these blowers typically produce a flat boost curve? I have no baseline pull. A stock, manual zl1 produced 540whp on this dyno, I’m told. My car is an auto.

TBH X-port is really only used on full tilt builds. Heads, cam etc. The dyno was in STD, your making 644, which is around 620whp SAE. With that upper pulley and the standard port i bet your whp results would be the same. 620 is very common with a 103/ported blower and a 2.3 upper.


Your not going to take advantage of the x-port on your other current mods tbh.

[JasonD]

Originally Posted by Z OH 6

Couple things I see wrong with this build. The 2.3 upper pulley isn't spinning the blower fast enough to take advantage of the Kong X-port. Also the 1 7/8" header are giving up some power.

Originally Posted by Camaro1973

TBH X-port is really only used on full tilt builds. Heads, cam etc. The dyno was in STD, your making 644, which is around 620whp SAE. With that upper pulley and the standard port i bet your whp results would be the same. 620 is very common with a 103/ported blower and a 2.3 upper.


Your not going to take advantage of the x-port on your other current mods tbh.

I’m simply putting information out there. Thanks for letting me know what I’ve done wrong. I figured since I was sending the blower out, I’d get the x port, since I’ll probably do more in the future.

[Z OH 6]

Originally Posted by JasonD

I’m simply putting information out there. Thanks for letting me know what I’ve done wrong. I figured since I was sending the blower out, I’d get the x port, since I’ll probably do more in the future.

If you plan to go much further with your mods in the future, there's nothing wrong with paying once for the X-Port, I was just stating that you're not gaining what you should from that mod without spinning the blower harder. The X-port was made for max effort stock blower builds. The X-port should start to shine a bit more when you up the boost to 18-20.

For reference I have practically the same mods, except I have the standard Kong port, and 2" headers, making 697whp on 93 octane. That being said, each dyno is different and I don't like comparing numbers from one dyno to the other.

[JasonD]

Originally Posted by Z OH 6

If you plan to go much further with your mods in the future, there's nothing wrong with paying once for the X-Port, I was just stating that you're not gaining what you should from that mod without spinning the blower harder. The X-port was made for max effort stock blower builds. The X-port should start to shine a bit more when you up the boost to 18-20.

For reference I have practically the same mods, except I have the standard Kong port, and 2" headers, making 697whp on 93 octane. That being said, each dyno is different and I don't like comparing numbers from one dyno to the other.

Does your boost increase with rpm like mine is showing? The tuner told me he expected the boost “curve” to look like this, before he ran it, because of the x port.

[Camaro1973]

Originally Posted by JasonD

Does your boost increase with rpm like mine is showing? The tuner told me he expected the boost “curve” to look like this, before he ran it, because of the x port.

Higher the rpm, more air, more boost pressure. So yes its going to scale exactly the same as any other blower, regardless of whats been done to it.

[Camaro1973]

Also noticed hes got you running quite rich also.

[KingLT1]

I would say the X port is working...making almost 15psi peak on a 2.3 with stock lower is quite a bit of boost. My brother just swapped a standard port w/ 2.17 pulley on his ZL1 and it's showing about a psi less then yours. The boost curve is flatter as well. It hits 12psi instantly from 3500rpm and builds to upper 13's by 6300rpm...and that is in cold air. Looks like you traded some bottom end for top end...which isn't a bad thing. I agree with above that it looks pretty rich...