Androo26 Posted April 17, 2015 Share Posted April 17, 2015 Hi peoples, as the name suggests ive started a new topic. So we can all share in the knoledge. http://austarletclub.com/index.php?/topic/20297-tf035-4cm-vs-6cm-turbine-housing/ Quote Link to post Share on other sites
5e colin Posted April 17, 2015 Share Posted April 17, 2015 to your thread dont bore out the housing mate keep the tfo35 core and fit the tdo4l compressor side prop and housing to make more cfm>torque u only need to get the core machined to take the bigger prop ( aluminium side ) i am getting the billet 50% upgrade for my tfo Quote Link to post Share on other sites
Androo26 Posted April 17, 2015 Author Share Posted April 17, 2015 (edited) I should clarify that the current turbo that im running is this Kinugawa one. http://shopping.kinugawaturbo.com/kinugawaturbo99-08subaruwrxforestertd04l-13t-6210hp-1-3.aspx Its basically a TD04 turbo (front cover , compressor wheel and 6cm turbine housing, with the smaller forester TF035 Exhaust wheel. Its how they are brand new. The boost does not drop off, it holds 14 psi all the way to redline. So my thinking is that the TF exhaust wheel is flowing enough not to restrict it at high revs. Im going to try the smaller turbine housing, hopefully it still holds to redline without choking, but with better spool up. Currently getting 14 psi at 3380 rpm. !.3L 4efe + T . Would like 14 psi at 2800-3000 You may have seen my build thread... ?? Here it is anyway. http://austarletclub.com/index.php?/topic/19604-project-starlet-andrew/ Edited April 17, 2015 by Androo26 Quote Link to post Share on other sites
5e colin Posted April 17, 2015 Share Posted April 17, 2015 (edited) will check your thread now go for the 15t or19t upgrade if you want to go extreme first on the tfo core and if it is to restrictive then use the tdo4 core Edited April 17, 2015 by 5e colin Quote Link to post Share on other sites
Androo26 Posted April 19, 2015 Author Share Posted April 19, 2015 Has any one tried putting a 4cm housing on a regular TD04-13T before ? Quote Link to post Share on other sites
richardc9052 Posted April 19, 2015 Share Posted April 19, 2015 Awesome thread, i dont know how your getting away with running 14psi on a 4efe though lol Quote Link to post Share on other sites
Turbo Goose Posted April 19, 2015 Share Posted April 19, 2015 Really interested in this. Currently have a tf035 and spool time is fantastic, i see full boost 1.1bar at 3100 rpmI am now looking at getting 280bhp but is the only way to go td04 or some crazy combo.Will need the spindle balancing but not sure where to get that done.And androo, you say you have the 6cm exhaust housing with the small tf exhaust wheel? Do you not have a massive gap between the exhaust housing and the blades? Quote Link to post Share on other sites
Androo26 Posted April 19, 2015 Author Share Posted April 19, 2015 Nah Turbo Goose the Kinugawa TF035 6cm housing is smaller than regular TD04 6cm ones in the outlet area to suit the small 35 turbine wheel. richardc9052- in Australia we have 98 octane. pump fuel very available to us ( nearly every fuel station has it.) and careful tuning. Quote Link to post Share on other sites
Androo26 Posted April 19, 2015 Author Share Posted April 19, 2015 Hey turbo goose is your TF35 stock or does it have a TD04 front cover and wheel ?? Quote Link to post Share on other sites
Turbo Goose Posted April 19, 2015 Share Posted April 19, 2015 It is stock my man. So your turbo is a tf035 exhaust housing bored out at the flange where it meets the exhaust manifold??And the compressor wheel is that off a td04??So basically a TF035 with a larger compressor wheel and a machined exhaust inlet? Quote Link to post Share on other sites
Androo26 Posted April 20, 2015 Author Share Posted April 20, 2015 Turbo goose - the turbo im currently running is basically a 6cm TF035 with TD04 front cover and compressor wheel from a WRX. I plan on swaping to the 4cm exhaust housing and testing the differences. No modifications to the flanges ... just all stock subaru and kinigawa stuff. Quote Link to post Share on other sites
5e colin Posted April 20, 2015 Share Posted April 20, 2015 the 4cm ( tfo ) exhaust housing will increase torque and way faster spool less lagg Quote Link to post Share on other sites
Androo26 Posted April 29, 2015 Author Share Posted April 29, 2015 I took some pics of the inside of each turbine housing just out of interest. 6cm* 4cm* You can really see how it necks down a lot in the smaller housing, about 1/3rd less id say... Probably more of a restriction than the 35mm turbine exducer.Wait and see. Quote Link to post Share on other sites
5e colin Posted April 29, 2015 Share Posted April 29, 2015 plenty of meat on the housing to port it bigger Quote Link to post Share on other sites
Androo26 Posted June 29, 2015 Author Share Posted June 29, 2015 First up appologies for the long time between posts.... but here is somthing to ponder Tonight I did some data logs to see how quick I could get this curent turbo to spool up by setting the gain control to 95% This is like pulling the waste gate line off.... only safer beacuse it has a boost cut set at 14.5psi . The gate will stay completly closed untill 95% of the target boost (14psi) is met. 13.3 psi. Because it ramps so quickly it spikes to 14.5 and cuts boost back to 6 psi straight away...... Its quite amazing how well it does it and can save you from destroying an engine. So the results were as follows . 5 runs 3rd gear wide open throttle from 2000 rpm. As ive mentioned before the boost controller reads 14 psi and the Microtech sees 13 due to pressure drop. Out of the 5 runs 3 of them saw 13 psi at 3380rpm and the other 2 saw it at 3320rpm.... so some where in the middle is a good point to start. No one ever drives there car like this but when normal driving it comes on really hard and fast.... its fun. After ive swaped to the 4cm housing I will do the same test with the same settings to see the difference in spool up between the 4cm and 6cm Turbine housings. For those that dont know this engine is / was a naturally aspirated 1.3L 4EFE with a turbo added. Quote Link to post Share on other sites
Androo26 Posted June 30, 2015 Author Share Posted June 30, 2015 The current turbo coming off to fit the smaller rear housing. I can confirm that the Subaru housing fits the Kinugawa turbo. Sitting back on the manifold.... Hopefully I can get it all back together tomorrow Quote Link to post Share on other sites
5e colin Posted June 30, 2015 Share Posted June 30, 2015 so just compressor side upgrade wheel and prop but same exhaust side ? Quote Link to post Share on other sites
Androo26 Posted July 1, 2015 Author Share Posted July 1, 2015 Upon further investigation ive run into a few minor alignment issues. The 4cm housing seems to be 2-3mm shorter from top to bottom, as per the pics. To combat this ive knocked up a 3mm copper spacer gasket. Hopefully this will see everything line up again..... I didnt think that it would all be a perfect swap over. Quote Link to post Share on other sites
Androo26 Posted July 3, 2015 Author Share Posted July 3, 2015 Ive been hard at it over the last couple of afternoons and its now back together except for the front bar and radiator cap. its been started and run upto temperature... Il do the rest in the morning. An engine bay view from high atop a ladder. Quote Link to post Share on other sites
Androo26 Posted July 4, 2015 Author Share Posted July 4, 2015 (edited) Data logs are in .... and the difinitive answer to "what is the spool difference between th 4cm* and 6cm* turbine housing at 14 psi" is....... 200 rpm. Here is a graph ive made up compareing the 2. However this may not seem like much at the peak boost pressure..... but the graph tells the story......on the road its much more punchy around the 3000 rpm mark and quicker to respond to throttle inputs especially when up around the 4K mark (twisty roads ect) Edited July 4, 2015 by Androo26 Quote Link to post Share on other sites
5e colin Posted July 4, 2015 Share Posted July 4, 2015 picy no worky Quote Link to post Share on other sites
Androo26 Posted October 2, 2015 Author Share Posted October 2, 2015 Ive picked up another 4cm TF035 for 50 bucks .... Im getting this smaller 4cm housing machined as we speak to suit a WRX TD04......... Same as a normal TD04 but with a 4cm housing instead of a 6cm....... Turbine and compressor wheels remain TD04 items... Just a different combo to test out. Quote Link to post Share on other sites
5e colin Posted October 2, 2015 Share Posted October 2, 2015 cool some more updates mine is a tfo35hm what size compressor wheel do i have then 13t or 15t ?????? Quote Link to post Share on other sites
Androo26 Posted October 3, 2015 Author Share Posted October 3, 2015 Just the run of the mill TD04L-13T Id love to see with this turbo what the max from a 4cm housing is !! Quote Link to post Share on other sites
Androo26 Posted October 5, 2015 Author Share Posted October 5, 2015 (edited) Sorry Collin I missread you question... Ive measured the TF035HM I have here and the compressor wheel measures at 51mm max 39.5mm min diameters. A TD04l compressor wheel measures at 56 and 40.7mm... So a bit smaller than a 13T As far as what its called... i dont know. To my knowledge the Forrester TF035 only came in one variation.....as far as the compressor size goes. Edited October 5, 2015 by Androo26 Quote Link to post Share on other sites
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