snowrx Posted March 15, 2019 Report Share Posted March 15, 2019 Ah, regrets of an early adopter, If they weren't so damn pricey, I'd trade in my MKI Stevens unit for a MKIII T4 G-car unit. Trump's car parts tariff would likely $mack me on the import now though. Quote Link to comment Share on other sites More sharing options...
lotusing Posted March 15, 2019 Report Share Posted March 15, 2019 I need your opinion on if its worth getting the external wastegate or not. Any thoughts? Quote Link to comment Share on other sites More sharing options...
MarkKassim Posted March 17, 2019 Author Report Share Posted March 17, 2019 Hi Pan, I take it the V band flange is for the connection of the rear system to the turbo, Leon can help you with that , you will have to send him the dimensions. The difference in the pipe layout is only changed for production , they are still collect in the same order , just 2 overlaps 3 or 3 overlaps 2. Hi Franco, for our needs I think the internal wastegate is fine. I know the external units can have better flow ,but they are very expensive and are really used on professional race cars. I know the S3 Esprits use one ,Alunox developed that set-up so it was a direct replacement. After dynoing my car I found I needed the Stiffer spring in the wastegate, as the flow characteristics of the Alunox manifold blew the wastegate open. The medium spring couldn't hold it. If you were going for very high power say around 500BHP then maybe go for the external. Mark Quote Link to comment Share on other sites More sharing options...
snowrx Posted March 18, 2019 Report Share Posted March 18, 2019 Hey Mark, I'm curious about the spec's on your system as installed, do you have the build listed somewhere? I'm running the "low" boost capsule on my EFR and have had no problems with the wastegate control. I'm using the B-W provided solenoid, controlled by a Megasquirt MS3X, but I'm keeping the boost low (<=10psi/160Kpa) in deference to my Citroen transaxle, so I might not in the same boost range. Quote Link to comment Share on other sites More sharing options...
plumdeplakmuis Posted March 18, 2019 Report Share Posted March 18, 2019 (edited) Hello Pan, what power level are you plan on running? G25-660 is a very good unit, fairly compact for the flow with very high EGT capability and available as a integrated wastegate unit as well. But spool-up of the EFR is better due to TiAl turbine which is 40% lighter than standard wheel material and 50% lighter than G25 high temp material, so if you don't go for more than 500hp i think EFR would be the better solution. But if you go over that it might be easier to fit G25-660 over EFR 7670 packaging wise. Edited March 18, 2019 by plumdeplakmuis Quote VAN DER LEE Turbo Systems - www.vdlee.com Link to comment Share on other sites More sharing options...
lotusing Posted March 18, 2019 Report Share Posted March 18, 2019 Hey Mark, Thanks for your help. The thing that I am looking for along side more power is reducing turbo lag even if I have to go with a smaller turbo. I like the external wastegate option. I will have to make up my mind. Quote Link to comment Share on other sites More sharing options...
pan Posted March 18, 2019 Report Share Posted March 18, 2019 14 hours ago, plumdeplakmuis said: Hello Pan, what power level are you plan on running? G25-660 is a very good unit, fairly compact for the flow with very high EGT capability and available as a integrated wastegate unit as well. But spool-up of the EFR is better due to TiAl turbine which is 40% lighter than standard wheel material and 50% lighter than G25 high temp material, so if you don't go for more than 500hp i think EFR would be the better solution. But if you go over that it might be easier to fit G25-660 over EFR 7670 packaging wise. Around 400whp. I want a really fast spool up time and response. it seems that g25 series is a good choice for this and its efficiecy is much better than EFR7670 , it has smaller compressor and turbine wheel and I can choose a 0.72 turbine housing. So I think it can compensate its weight. But G25 is lack of the choice for turbine flange and no twin scroll choice for 0.72 A/R. Quote Link to comment Share on other sites More sharing options...
pan Posted March 19, 2019 Report Share Posted March 19, 2019 On 18/03/2019 at 04:09, MarkKassim said: Hi Pan, I take it the V band flange is for the connection of the rear system to the turbo, Leon can help you with that , you will have to send him the dimensions. The difference in the pipe layout is only changed for production , they are still collect in the same order , just 2 overlaps 3 or 3 overlaps 2. Hi Franco, for our needs I think the internal wastegate is fine. I know the external units can have better flow ,but they are very expensive and are really used on professional race cars. I know the S3 Esprits use one ,Alunox developed that set-up so it was a direct replacement. After dynoing my car I found I needed the Stiffer spring in the wastegate, as the flow characteristics of the Alunox manifold blew the wastegate open. The medium spring couldn't hold it. If you were going for very high power say around 500BHP then maybe go for the external. Mark Mark, both of the inlet and outlet of turbine are V band but with different size, Is it possible to send Alunox the turbocharger or turbine side for alignment? Quote Link to comment Share on other sites More sharing options...
plumdeplakmuis Posted March 21, 2019 Report Share Posted March 21, 2019 Hello Pan, if you are targeting 400hp EFR 7163 would be better suitable (pn.11639880002) 7670 is too large Quote VAN DER LEE Turbo Systems - www.vdlee.com Link to comment Share on other sites More sharing options...
MarkKassim Posted March 21, 2019 Author Report Share Posted March 21, 2019 On 19/03/2019 at 16:22, pan said: Mark, both of the inlet and outlet of turbine are V band but with different size, Is it possible to send Alunox the turbocharger or turbine side for alignment? Hi Pan, I believe you have managed to speak with Leon about alignment, I've sent sent some info as well. Mark Quote Link to comment Share on other sites More sharing options...
MrDangerUS Posted March 23, 2019 Report Share Posted March 23, 2019 On 21/03/2019 at 14:33, MarkKassim said: Hi Pan, I believe you have managed to speak with Leon about alignment, I've sent sent some info as well. Mark Mark, Do you know if Alunox solved the "narrow neck" @ collector issue? I.E.: the area where 2/3 branch merges with 1/4 branch? Quote MrDangerUS Link to comment Share on other sites More sharing options...
MrDangerUS Posted January 8, 2022 Report Share Posted January 8, 2022 Alunox corrected Dave's (Changes) part. Did they change their production run? Quote MrDangerUS Link to comment Share on other sites More sharing options...
MrDangerUS Posted March 29, 2022 Report Share Posted March 29, 2022 I understand, the tube is SS 321, but could anyone tell me what s/steel grade are these flanges made off? Quote MrDangerUS Link to comment Share on other sites More sharing options...
snowrx Posted March 31, 2022 Report Share Posted March 31, 2022 That tube looks round where it's welded to the flange. Is that the case, does it transition to the port shape within the depth of the flange? Quote Link to comment Share on other sites More sharing options...
sailorbob Posted March 31, 2022 Report Share Posted March 31, 2022 This is what the inside of one of the runners looks like on the first batch made: Quote Link to comment Share on other sites More sharing options...
snowrx Posted March 31, 2022 Report Share Posted March 31, 2022 My second batch manifold looks the same, with the oval tube transition. Mr D's picture just looked like a shorter transition than I thought the CNC flange had. Looks like ongoing revisions, as the initial flange looks different. Quote Link to comment Share on other sites More sharing options...
MarkKassim Posted April 7, 2022 Author Report Share Posted April 7, 2022 I believe the flange is SS316 , the main tube is SS321 to avoid cracking at the temperatures we run at. The flange is a lot thicker and cracking isn't an issue. I believe this configuration is also used in the motorsport systems Alunox make for other cars. Quote Link to comment Share on other sites More sharing options...
MrDangerUS Posted April 20, 2022 Report Share Posted April 20, 2022 FYI: chamfering holes makes installation over the studs much easier. I wish Alunox would incorporate such modification into next batch. 1 Quote MrDangerUS Link to comment Share on other sites More sharing options...
Popular Post MrDangerUS Posted November 19, 2022 Popular Post Report Share Posted November 19, 2022 Last winter I have installed this header on my S4s. Not the easiest task if you do it with your engine in situ, but reward is enormous. It morphed my car into a ROCKET! Incredible acceleration and performance improvement! Driving becomes an eye popping experience at only 0.6 Bar + foot 1/2 way to the floor. For obvious reasons, I'm not going to tell you how fast car was going. Can't imagine how scary it will be at 1 Bar, if I find a suitable road or if someone let me in to the airport. Alunox header is worth every penny and bloody knuckles! I also have fitted a better flowing turbo of my own specs. I'm sure, that helped a bit, too. FYI: I have built one extra, if I can interest someone. Outside looks completely "stock". 5 1 Quote MrDangerUS Link to comment Share on other sites More sharing options...
Gold FFM Barrykearley Posted November 19, 2022 Gold FFM Report Share Posted November 19, 2022 It absolutely transformed mine. I’ve a different turbo with a bit more boost set. The comparison to a stock car is chalk and cheese. Add in an LSD unit and suddenly it will all become beautiful. Quote Only here once Link to comment Share on other sites More sharing options...
Giniw Posted November 21, 2022 Report Share Posted November 21, 2022 (edited) @MrDangerUS Is it a new S4s turbine housing by any chances? Are the stock ones available? (I suspect mine has a small crack so ... 😕 ) Edited November 21, 2022 by Giniw Quote Link to comment Share on other sites More sharing options...
Sam Grant Posted November 23, 2022 Report Share Posted November 23, 2022 John D - is that running on a different tune/map or the stock s4s tune/ecu? What is the price on the "stock looking" but not stock turbo? Quote Link to comment Share on other sites More sharing options...
MrDangerUS Posted November 30, 2022 Report Share Posted November 30, 2022 On 23/11/2022 at 00:04, Sam Grant said: John D - is that running on a different tune/map or the stock s4s tune/ecu? What is the price on the "stock looking" but not stock turbo? @Sam Grant No need to re-map, unless you're tracking the car.Turbo delivers stunning performance with OE S4s MK V chip and 370 cc/mm RC Engineering "peak and hold" primary injectors and 270 cc/min (25.7 lb/hr) RC Racing high impedance secondary injectors, (the same as Dermot's, https://users.ox.ac.uk/~ohare/ ). please gimme a shout at mrdangerUS@hotmail.com for further details Quote MrDangerUS Link to comment Share on other sites More sharing options...
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