Lower intake
 

Has anybody done a port and polish or extrude hone on a lower intake? If so what type of gains did you receive.

Synolimit. Megan370z.

Thanks I will check them out.

Just got back my lower intake and installed it. It made a big difference in my engine response. Im getting on the dyno sept.3rd to see if it gave me any gains.

Finished product.

http://i61.tinypic.com/2gy9gyw.jpg

http://i62.tinypic.com/nv8713.jpg

http://i62.tinypic.com/2mgjsqv.jpg

http://i59.tinypic.com/jtv1v8.jpg

http://i57.tinypic.com/2s9409v.jpg

Do you have the Z1 plenum? I was thinking about doing this also

Will be interested in what happens with this also, I just installed my M370 and felt a NICE difference in the car and Z1 HFC's just went in 2 hrs ago. Looking to finish off my NA build

Looks great, I wonder if there is any merit in doing this on a boosted application. I doubt the gains would be as great.

I have an extra one for sale if somebody would like to do this but doesn't want their car down for lead time.

Yes I have the Z1 plenum and bored throttle bodies. The motor was very responsive before but after the lower intake got gasket matched and extrude honed it took it to another level. Getting retuned September 3rd.

Not any more!:tiphat:

Just got dynoed and my car out down 340 whp and 265ft tq. I think the lower intake mod was worth the money. I will post the sheet sometime this week.

Holy cow that is great numbers!! What mods do u have on ur Z?

Can you please tell me who did the work as well as the cost. Thanks

Extrude Hone in California. I sent them the gaskets and the intake and they did the rest. It cost me 600 dollars. I know that's expensive but it's another step done next is a stroker kit.

we all know the Z1 modified oem intake produce gain...
but what we will never know is, if there was in Fact any gain relied to your polish of your lower intake ....

unless you get another OEM unmodified and test it back to back on the dyno with the only part being changed

because the way you are mentioning is you all did that together

a placebo effect is soo each easy to feel without knowing it.

600$ :O For just the port work? Or all together with buying the lower intake?

Great point Megan but I doubt I'm going to put down 340 with my Motordyne mani and Z1 HFC's. The lower had to give something. I'm going to be happy with 310 WHP

Well before I had 318whp and 260ft tq without stillen headers and the lower intake. So with that combo it gave me 20 more hp. And extrude hone is more than a port and polish. The 600 dollars was just for the work I paid 185 for a used intake.

And I used the same dyno to be alittle more accurate.

so now you are saying you gained 20whp with the stillen header & the ported lower intake ? which brought the result to your claimed 340whp ?

Im having a hard time believing it.
something was not tuned right before or something.

I care less about the 340whp because we know that doesnt mean much but just a reference point ... What I have problem with is that 20whp gain from stillen header and a ported lower intake.

I'm curious to see what Just a ported lower intake manifold dynos, before and after...

~Reagan

Well i used the same dyno the same tuner and he started with my current UpRev tune. He made the adjustments and thats what went down bro. Sorry its hard for you to believe.

u mad bro ?

Yeah it's not that hard to believe lol. The Stillen headers with the ported intake combined with uprev adjustments could very easily gain 20hp. Stillen headers aren't the best but they are good for at least a few ponies with adjustments

Me too!

Not at all just stating the facts bro.

If you are ready to believe any claim from a guy who isnt showing any dynosheet and doing those test without doing it properly to really find what modification give what.

go ahead and blindly believe it.

the stillen header has never really gave anything and we never on this board proved it was giving much more than a few whp like you say ... 5-7whp at best.

that porting giving about 10-15whp is indeed hard to believe.
unless it wasn't tuned correctly previously or at all.


the topic is about the lower intake gain but the OP added another variable which we wont know what the lower intake can provide.

read my post previously and show me the facts than just what you are trying to prove.



I just want to believe gain as I truly believe the VHR can gain a ton of power from stock .... I ended at 68whp over stock 2-3 years ago before I blew the VVEL and I am sure it could go close to 90whp over stock.

so im not bashing you but doing testing and proving what mods gives what has to be done correctly

was that 318whp with the Z1 intake and over sized TB really tuned at 100%
or just a quick tune as most tuner does.

and then you installed the stillen header and ported lower intake
it gave what 340 exactly ? with a tune?


you never showed any dynosheet to put weight to your claim

so I just want to believe but you aren't proving it right now.

Can you give the specs of how much you bored from your TBs and where you got them done. and how much you extruded from the manifold?

what CAI are you running with your bored TBs? what other mods do you have? sorry for all the questions, just want to get a better idea of what could contribute to your gains. if 340 is legit, then you should consider cams next.

Below are the numbers before and after.

http://i60.tinypic.com/16a5ead.jpg

http://i57.tinypic.com/2j5j6lw.jpg

Thank you ;)

so with stillen headers and your lower intake porting gained 20whp
there is quite a nice jump starting at 6800 to 7500rpm ( that's where the VVEL jump at his max)

there is a steady 2-6whp gain from 2600 to 6000rpm then start to open up 10whp gain at 6800. Then end up with a 20whp gain at peak.

Not bad, I wonder how much of gain is related to the porting.

Was the temperature similar for the before and after dynos?

From just the extrude honing I don't know but I definitely felt the difference with my butt dyno. Next are the heads and I will post whether it makes power or not. Ptuning s dyno is in an environmental controlled room so the conditions are pretty much the same. I'm just exploring how much power this NA motor can make.

what do you plan on doing to the heads? Can you please list the other mods that you have? thanks and good luck with your plans

Hmmmm so I guess I was right in believing him this whole time!

I'm disassembling my heads and going to Extrude Hone them and get a three angle valve job and slap them back on and see what happens. I would like to thank Jon @ Z1 motorsports and Patrick from Ptuning without there help I couldn't make this project work. I will create a sig that list all of my mods.

Damn. My lowers I sell ported sound good then at only $485 plus I do a core refund!

I can do if people help me out. I have ported ones plus throttle bodies ready to start moving. I tried to dyno like the OP and it didn't work out because time was to great between dyno events. What I really need is a local to buy the parts and we all head to the dunk and do everything the same day.

Maybe, maybe not. How much recalibration done with the dyno months or weeks apart? Tuner mess with any settings within the computer of the dyno? I'd still like to see temps and such. Also what's the correction factor setting? These numbers could be the difference of SAE to STD or SAE to STP. Lotta lotta variables here. Like Megan said. ONLY!!!!! Way is same day, same dyno, no touching.