custom made inlet for X20XEV

GeorgeGG · 01-10-2008, 22:34

can anybody show me custom made inlet manifold for X20XEV?
i want to make one for my wifes ASTRA G ... i got old inlet from Omega B which has no ASC to cut it... but i cant decide what kinde to make.. as there is too lil place for manifold.. i think only OEM will fit there..
can anybody help?

gse_turbo · 02-10-2008, 16:57

I've seen a few different styles but to be honest the OE is quite good. all the ones I've seen have given minimal power gains and actually taken torque away. if you want to do a custome piece I suggest going all the way with an ITB set-up, your XEV is cable throttle or DBY?
Garrett

GeorgeGG · 03-10-2008, 08:08

Quote:

Originally Posted by gse_turbo

I've seen a few different styles but to be honest the OE is quite good. all the ones I've seen have given minimal power gains and actually taken torque away. if you want to do a custome piece I suggest going all the way with an ITB set-up, your XEV is cable throttle or DBY?
Garrett

mine is with cable throttle and with MS ecu

gse_turbo · 03-10-2008, 17:40

yes in that case I do suggest ITB's if you really want a custom unit.

cheers

GeorgeGG · 04-10-2008, 22:24

anyone?

EY · 04-10-2008, 22:28

You've had an answer from probably the most qualified person on the forum to give one.

GeorgeGG · 04-10-2008, 22:43

gse_turbo

what itbs shell i use? can u show me?

gse_turbo · 07-10-2008, 20:28

well I'm doing a custom set from a toyota silver top motor. they are pretty nice but it's a hard way to go about it. I chose to go custom because bringing over a ready built setup from the UK is pretty expensive... exchange rate and all.

what I would do in your place is get the kit from QED, I think SBD has a kit as well. they use webber itbs and come with everything needed to bolt right up.

I'm looking at the QED catalogue right now and they have two options. a DCOE that is basically an adaptor to use a seperate ITB's or carbs. the other is a direct to head that has the ITB's built into the manifold.

QED has two KIT options that I think would do you well. the 'TB160E' includes the direct to head ITB's, DTA ECU, preset fuel pressure regulator and thw loom needed, that's about 1525quid.
the other kit is their 'TB195E' KIT, it comes with the direct to head ITB's, DTA ECU, Q405H cams, fuel reg, and race rod bolts to handle high RPM's, this one comes in at about 1900quid.

both their DCOE and direct to head ITB kit use 45mm throttles.

GeorgeGG · 08-10-2008, 11:14

prices are astronomic for me..

GeorgeGG · 08-10-2008, 11:17

what u think to make custom manifold with 20cm runners ? kind of like dbilas flowmaster

gse_turbo · 09-10-2008, 16:42

Quote:

Originally Posted by GeorgeGG

what u think to make custom manifold with 20cm runners ? kind of like dbilas flowmaster

it's the way I would go, like I said before you will drop the torque a bit and that will be the only difference in performance.

there are a few people on her that have a DBilas inlet and say thay have gotten a power loss.

genuinely, for the kind of money vs. the gains, you are far better off with a really good port matching to the head and the throttle.

the only time I would really suggest a manifold like the DBilas is if you were to build a turbo motor. I say this because the turbo response will be a bit faster than with the standard inlet. also it would help to even out the power and torque which is better for the gearbox.

with the heavy crank, heavy flywheel and long runners the ecotec makes a ton of torque (over the power anyways). so with a power adder the shorter runners isn't a big concern.

GeorgeGG · 10-10-2008, 08:55

Quote:

Originally Posted by gse_turbo

it's the way I would go, like I said before you will drop the torque a bit and that will be the only difference in performance.

there are a few people on her that have a DBilas inlet and say thay have gotten a power loss.

genuinely, for the kind of money vs. the gains, you are far better off with a really good port matching to the head and the throttle.

the only time I would really suggest a manifold like the DBilas is if you were to build a turbo motor. I say this because the turbo response will be a bit faster than with the standard inlet. also it would help to even out the power and torque which is better for the gearbox.

with the heavy crank, heavy flywheel and long runners the ecotec makes a ton of torque (over the power anyways). so with a power adder the shorter runners isn't a big concern.

eh.. on i will leave that idea of custom manifold than.. Astra G does not have much place for longer runners...

gse_turbo · 10-10-2008, 16:14

one thing you might be interested in is using a tubulat turbo manifold and modifying it for an inlet. it's an idea i've kicked around for a while. there is a guy up in Canada that's gonna give it a go. he will be the first to actually do it that I know of. the idea is solid and with the proper manifold it would be a benefit. the only thing to really look for in this case is a manifold with the right size tube diameters.

take a look see...

Quote:

Originally Posted by PrecisionBoost

My new stainless manifolds arrived.... the one is a Silvia S14 manifold with an offset and the other is an equal length Honda B16 manifold.
The plan is to remove both flanges, weld on the 2.0L 16V flange onto the Silvia manifold and change it to an external wastegate style.
The B16 is going to be an intake manifold... flanges will come off and I will modify it to work with the design I had in mind.
At $99 for the S14 manifold and $149 for the Honda manifold it was cheaper than me making everything myself.
The flanges are mild steel....but the runners are stainless.... so I will be welding on the SS flanges I got from Garrett a few months back (or is it years now

)

mikuni · 15-10-2008, 02:15

^ There is a toyota engine that runs that factory. 7afe I think? Personally, I don't think it would be very good for power but you are likely to see a good torque increase. I wouldn't bother with it myself.

gse turbo, I have an X20XEV with Toyota 20 valve silvertop throttle bodies and custom trumpets. It has custom headers (that are crap) and a ported head. I haven't done cams yet but they are next on the list, along with vernier pulleys. Its all run on an aftermarket ecu made by a company down here, Link.

I can't post pictures at the moment unfortunately but let me know if you're interested as I may be able to help you a long the way.

mikuni · 15-10-2008, 04:35

Found a couple pictures now that I'm at home.

The 20v throttles

Its in my Chevette

TigraTurbo · 15-10-2008, 04:54

Its beutifull man.....those rears kick ass!!!

gse_turbo · 15-10-2008, 16:55

how that is DAMN SEXY! well done, I may need some help with the hoock ups (plugs, vacuum, etc.) I have the flanges ready to cut, I actually brought the throttles closer together that how they are from the factory. haven't put it together yet, only have a couple sample flanges cut. how did you go about your runners?

mikuni · 15-10-2008, 19:40

We made the runners from stainless but I wish it was ali now, as it would have been so much easier to work with. The 20v throttles match up well with factory spacing so I just had 2 flanges made up and joined them together with a slight flare to get the size right and to taper it down nicely to the intake port.

Unfortunately, due to space constrained the guy making them made a big of a **** up. He designed it all perfectly on a nice angle down into the ports and then realised that the throttle linkages got in the way when on full throttle (he hadn't accounted for that). So he dropped the angle down of the intake but still couldn't manage to get clearance for the injectors. After this he decided to put them underneath, which kind of goes against how it should be. It doesn't worry me too much though as I plan to put outboard injectors on once I do cams etc so it will solve that issue.

What I would do however, if I was strapped for space in there which you more than likely would be in a FWD configuration, is turn the throttles upside down. This will place the linkage and everything out of the way of the injectors and underneath the manifold.

The other small issue is probably the vacuum - there is none. I'm not sure what people usually do here, other than running an airbox but we couldn't get any vacuum off idle. The car is tuned on the TPS alone but that seems to work pretty well.

gse_turbo · 15-10-2008, 20:57

pretty good tip I'll take a look at them upside down. i'm starting to thing that electric vacuum pump may be a pretty good idea.

BEN LEE · 15-10-2008, 21:22

cool great projet i miss my astra ecotec on tbs

mikuni · 15-10-2008, 22:04

Quote:

Originally Posted by gse_turbo

i'm starting to thing that electric vacuum pump may be a pretty good idea.

You could be right. I don't even use a brake booster so the only purpose that I have for vacuum is for engine control. In a larger car, where there is a need for a booster I would recommend trying to get something sorted.

If you run a sealed air box over the trumpets, in much the same way as a plenum works, you should be able to collect some vacuum from there and it shouldn't hinder the sound too much.

I have a carbon fibre air box that I will be using in the future so I'll try to get a little bit of a project thread up to keep you guys in the loop with my progress.

As a side note, anyone have any info on cams for the x20xev? I'm thinking about just grinding a set of mine up but have heard some bad stuff about doing this.

gse_turbo · 15-10-2008, 22:53

Quote:

Originally Posted by mikuni

As a side note, anyone have any info on cams for the x20xev? I'm thinking about just grinding a set of mine up but have heard some bad stuff about doing this.

I I have very good luck here in the states. I have a company do 'hard-welds' instead of regrinds. they actually add material to the lobe before reprofiling, this way you don't have to shim the fallowers. there is another comapany I sell from Belgium, they supply most of the valve train components including verniers. they are called Cat Cams, I'm sure they have a dealer near you. you can go to there site and see their dealers by country

mikuni · 16-10-2008, 07:46

True, I forgot about adding in material.

I looked at the Cat Cams site, unfortunately they don't have outlets anywhere near me and the freight and difficulties in dealing with any of the countries listed will probably be too difficult for me. One good thing is that they have some very good specs and information on their website, which could prove very helpful in the future.

BEN LEE · 16-10-2008, 17:40

i had courtney hi torque cams but changed to standered cams reprofile by autosrint big inprovment.

http://www.migweb.co.uk/forums/migcl...astra-gsi.html